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docs: update links and layout
Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
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140
README.md
140
README.md
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@ -5,8 +5,9 @@
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## About
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GitHub Action to extract metadata from Git reference and GitHub events.
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This action is particularly useful if used with [Docker Build Push](https://github.com/docker/build-push-action) action to tag and label Docker images.
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GitHub Action to extract metadata from Git reference and GitHub events. This action
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is particularly useful if used with [Docker Build Push](https://github.com/docker/build-push-action)
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action to tag and label Docker images.
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@ -44,7 +45,7 @@ ___
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* [Major version zero](#major-version-zero)
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* [JSON output object](#json-output-object)
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* [Overwrite labels](#overwrite-labels)
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* [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
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* [Contributing](#contributing)
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## Usage
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@ -165,8 +166,8 @@ jobs:
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### Bake definition
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This action also handles a bake definition file that can be used with the
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[Docker Bake action](https://github.com/docker/bake-action). You just have to declare an empty target named
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`docker-metadata-action` and inherit from it.
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[Docker Bake action](https://github.com/docker/bake-action). You just have to
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declare an empty target named `docker-metadata-action` and inherit from it.
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```hcl
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// docker-bake.hcl
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@ -226,7 +227,8 @@ jobs:
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targets: build
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```
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Content of `${{ steps.meta.outputs.bake-file }}` file will look like this with `refs/tags/v1.2.3` ref:
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Content of `${{ steps.meta.outputs.bake-file }}` file will look like this with
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`refs/tags/v1.2.3` ref:
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```json
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{
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@ -285,13 +287,13 @@ Following inputs can be used as `step.with` keys
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Following outputs are available
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| Name | Type | Description |
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|---------------|---------|-------------------------------------------------------------------------------|
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| `version` | String | Docker image version |
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| `tags` | String | Docker tags |
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| `labels` | String | Docker labels |
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| `json` | String | JSON output of tags and labels |
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| `bake-file` | File | [Bake definition file](https://github.com/docker/buildx#file-definition) path |
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| Name | Type | Description |
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|---------------|---------|--------------------------------------------------------------------------------------------|
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| `version` | String | Docker image version |
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| `tags` | String | Docker tags |
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| `labels` | String | Docker labels |
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| `json` | String | JSON output of tags and labels |
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| `bake-file` | File | [Bake file definition](https://docs.docker.com/build/customize/bake/file-definition/) path |
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## `images` input
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@ -328,13 +330,16 @@ flavor: |
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```
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* `latest=<auto|true|false>`: Handle [latest tag](#latest-tag) (default `auto`)
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* `prefix=<string>,onlatest=<true|false>`: A global prefix for each generated tag and optionally for `latest`
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* `suffix=<string>,onlatest=<true|false>`: A global suffix for each generated tag and optionally for `latest`
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* `prefix=<string>,onlatest=<true|false>`: A global prefix for each generated
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tag and optionally for `latest`
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* `suffix=<string>,onlatest=<true|false>`: A global suffix for each generated
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tag and optionally for `latest`
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## `tags` input
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`tags` is the core input of this action as everything related to it will reflect the output metadata. This one is in
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the form of a key-value pair list in CSV format to remove limitations intrinsically linked to GitHub Actions
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`tags` is the core input of this action as everything related to it will
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reflect the output metadata. This one is in the form of a key-value pair list
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in CSV format to remove limitations intrinsically linked to GitHub Actions
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(only string format is handled in the input fields). Here is an example:
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```yaml
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type=schedule,pattern={{date 'YYYYMMDD'}}
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```
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Will be used on [schedule event](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#schedule).
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Will be used on [schedule event](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#schedule).
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`pattern` is a specially crafted attribute to support [Handlebars' template](https://handlebarsjs.com/guide/)
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with the following expressions:
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`pattern` is a specially crafted attribute to support [Handlebars' template](https://handlebarsjs.com/guide/) with
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the following expressions:
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* `date 'format'` ; render date by its [moment format](https://momentjs.com/docs/#/displaying/format/)
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| Pattern | Output |
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type=semver,pattern={{version}},value=v1.0.0
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```
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Will be used on a [push tag event](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push)
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and requires a valid [semver](https://semver.org/) Git tag, but you can also use a custom value through `value`
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attribute.
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Will be used on a [push tag event](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#push)
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and requires a valid [semver](https://semver.org/) Git tag, but you can also
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use a custom value through `value` attribute.
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`pattern` attribute supports [Handlebars template](https://handlebarsjs.com/guide/)
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with the following expressions:
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`pattern` attribute supports [Handlebars template](https://handlebarsjs.com/guide/) with the following expressions:
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* `raw` ; the actual tag
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* `version` ; shorthand for `{{major}}.{{minor}}.{{patch}}` (can include pre-release)
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* `major` ; major version identifier
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@ -439,9 +447,10 @@ attribute.
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| `v2.0.8-beta.67` | `{{version}}` | `2.0.8-beta.67` |
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| `v2.0.8-beta.67` | `{{major}}.{{minor}}` | `2.0.8-beta.67`* |
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> *Pre-release (rc, beta, alpha) will only extend `{{version}}` (or `{{raw}}` if specified) as tag
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> because they are updated frequently, and contain many breaking changes that are (by the author's design)
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> not yet fit for public consumption.
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> *Pre-release (rc, beta, alpha) will only extend `{{version}}` (or `{{raw}}`
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> if specified) as tag because they are updated frequently, and contain many
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> breaking changes that are (by the author's design) not yet fit for public
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> consumption.
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Extended attributes and default values:
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type=pep440,pattern={{version}},value=1.0.0
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```
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Will be used on a [push tag event](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push)
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and requires a Git tag that conforms to [PEP 440](https://www.python.org/dev/peps/pep-0440/), but you can also use a
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custom value through `value` attribute.
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Will be used on a [push tag event](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#push)
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and requires a Git tag that conforms to [PEP 440](https://www.python.org/dev/peps/pep-0440/),
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but you can also use a custom value through `value` attribute.
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`pattern` attribute supports [Handlebars template](https://handlebarsjs.com/guide/)
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with the following expressions:
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`pattern` attribute supports [Handlebars template](https://handlebarsjs.com/guide/) with the following expressions:
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* `raw` ; the actual tag
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* `version` ; cleaned version
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* `major` ; major version identifier
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@ -485,9 +496,10 @@ custom value through `value` attribute.
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| `1.2.3beta2` | `{{major}}.{{minor}}` | `1.2.3b2`* |
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| `1.0dev4` | `{{major}}.{{minor}}` | `1.0.dev4`* |
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> *dev/pre/post release will only extend `{{version}}` (or `{{raw}}` if specified) as tag
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> because they are updated frequently, and contain many breaking changes that are (by the author's design)
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> not yet fit for public consumption.
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> *dev/pre/post release will only extend `{{version}}` (or `{{raw}}` if
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> specified) as tag because they are updated frequently, and contain many
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> breaking changes that are (by the author's design) not yet fit for public
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> consumption.
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Extended attributes and default values:
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type=match,pattern=v(.*),group=1,value=v1.0.0
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```
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Can create a regular expression for matching Git tag with a pattern and capturing group. Will be used on a
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[push tag event](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push) but, you can also use
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a custom value through `value` attribute.
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Can create a regular expression for matching Git tag with a pattern and
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capturing group. Will be used on a [push tag event](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#push)
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but, you can also use a custom value through `value` attribute.
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| Git tag | Pattern | Group | Output |
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|-------------------------|------------------|---------|------------------------|
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type=edge,branch=main
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```
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An `edge` tag reflects the last commit of the active branch on your Git repository. I usually prefer to use `edge`
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as a Docker tag for a better distinction or common pattern. This is also used by official images
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like [Alpine](https://hub.docker.com/_/alpine).
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An `edge` tag reflects the last commit of the active branch on your Git
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repository. I usually prefer to use `edge` as a Docker tag for a better
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distinction or common pattern. This is also used by official images like [Alpine](https://hub.docker.com/_/alpine).
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Extended attributes and default values:
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```
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This type handles Git ref (or reference) for the following events:
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* `branch` ; eg. `refs/heads/master`
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* `tag` ; eg. `refs/tags/v1.0.0`
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* `pr` ; eg. `refs/pull/318/merge`
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### Image name and tag sanitization
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In order to comply with [the specification](https://docs.docker.com/engine/reference/commandline/tag/#extended-description),
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In order to comply with [the specification](https://docs.docker.com/engine/reference/commandline/tag/#description),
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the image name components may contain lowercase letters, digits and separators.
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A separator is defined as a period, one or two underscores, or one or more
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dashes. A name component may not start or end with a separator.
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@ -648,7 +661,9 @@ To ease the integration in your workflow, this action will automatically:
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### Latest tag
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`latest` tag is handled through the [`flavor` input](#flavor-input). It will be generated by default (`auto` mode) for:
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`latest` tag is handled through the [`flavor` input](#flavor-input). It will be
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generated by default (`auto` mode) for:
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* [`type=ref,event=tag`](#typeref)
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* [`type=semver,pattern=...`](#typesemver)
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* [`type=match,pattern=...`](#typematch)
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Returns the branch name that triggered the workflow run. Will be empty if not
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a branch reference:
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| Event | Ref | Output |
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|-----------------|-------------------------------|---------------------|
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| `pull_request` | `refs/pull/2/merge` | |
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| `push` | `refs/heads/master` | `master` |
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| `push` | `refs/heads/my/branch` | `my-branch` |
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| `push tag` | `refs/tags/v1.2.3` | |
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| Event | Ref | Output |
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|----------------|------------------------|-------------|
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| `pull_request` | `refs/pull/2/merge` | |
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| `push` | `refs/heads/master` | `master` |
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| `push` | `refs/heads/my/branch` | `my-branch` |
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| `push tag` | `refs/tags/v1.2.3` | |
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#### `{{tag}}`
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### Major version zero
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Major version zero (`0.y.z`) is for initial development and **may** change at any time. This means the public API
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[**should not** be considered stable](https://semver.org/#spec-item-4).
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Major version zero (`0.y.z`) is for initial development and **may** change at
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any time. This means the public API [**should not** be considered stable](https://semver.org/#spec-item-4).
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In this case, Docker tag `0` **should not** be generated if you're using [`type=semver`](#typesemver) with `{{major}}`
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pattern. You can manage this behavior like this:
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In this case, Docker tag `0` **should not** be generated if you're using [`type=semver`](#typesemver)
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with `{{major}}` pattern. You can manage this behavior like this:
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```yaml
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# refs/tags/v0.1.2
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@ -783,8 +798,8 @@ tags: |
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### JSON output object
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The `json` output is a JSON object composed of the generated tags and labels so that you can reuse them further in your
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workflow using the [`fromJSON` function](https://docs.github.com/en/actions/learn-github-actions/expressions#fromjson):
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The `json` output is a JSON object composed of the generated tags and labels so
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that you can reuse them further in your workflow using the [`fromJSON` function](https://docs.github.com/en/actions/learn-github-actions/expressions#fromjson):
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```yaml
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-
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org.opencontainers.image.vendor=MyCompany
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```
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## Keep up-to-date with GitHub Dependabot
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## Contributing
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Since [Dependabot](https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot)
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has [native GitHub Actions support](https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#package-ecosystem),
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to enable it on your GitHub repo all you need to do is add the `.github/dependabot.yml` file:
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```yaml
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version: 2
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updates:
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# Maintain dependencies for GitHub Actions
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- package-ecosystem: "github-actions"
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directory: "/"
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schedule:
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interval: "daily"
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```
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Want to contribute? Awesome! You can find information about contributing to
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this project in the [CONTRIBUTING.md](/.github/CONTRIBUTING.md)
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## v2 to v3
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* Repository has been moved to docker org. Replace `crazy-max/ghaction-docker-meta@v2` with `docker/metadata-action@v4`
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* Repository has been moved to docker org. Replace `crazy-max/ghaction-docker-meta@v2`
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with `docker/metadata-action@v4`
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* The default bake target has been changed: `ghaction-docker-meta` > `docker-metadata-action`
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## v1 to v2
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core.endGroup();
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setOutput('json', jsonOutput);
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// Bake definition file
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// Bake file definition
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const bakeFile: string = meta.getBakeFile();
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core.startGroup(`Bake definition file`);
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core.startGroup(`Bake file definition`);
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core.info(fs.readFileSync(bakeFile, 'utf8'));
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core.endGroup();
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setOutput('bake-file', bakeFile);
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# syntax=docker/dockerfile:1
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FROM alpine
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RUN echo "Hello world!"
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