docker-metadata/README.md

About

GitHub Action to extract metadata (tags, labels) for Docker. This action is particularly useful if used with Docker Build Push action.

If you are interested, check out my other :octocat: GitHub Actions!

---

• Features
• Usage
• Customizing
  • inputs
  • outputs
• Keep up-to-date with GitHub Dependabot
• How can I help?
• License

Features

• Docker tags generated through GitHub action event and Git metadata
• OCI Image Format Specification used to generate Docker labels

Usage

Event	Ref	Commit SHA	Docker Tag	Pushed
schedule			nightly	Yes
pull_request	refs/pull/2/merge	a123b57	sha-a123b57, pr-2	No
push	refs/heads/<default_branch>	676cae2	sha-676cae2, edge	Yes
push	refs/heads/dev	cf20257	sha-cf20257, dev	Yes
push	refs/heads/my/branch	a5df687	sha-a5df687, my-branch	Yes
push tag	refs/tags/v1.2.3		1.2.3, latest	Yes
push tag	refs/tags/mytag		mytag	Yes

name: ci

on:
  schedule:
    - cron: '0 10 * * *' # everyday at 10am
  push:
    branches:
      - '**'
    tags:
      - 'v*.*.*'
  pull_request:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Docker meta
        id: docker_meta
        uses: crazy-max/ghaction-docker-meta@v1
        with:
          images: |
            name/app
            ghcr.io/name/app            
          tag-sha: true
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to DockerHub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1 
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      -
        name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64,linux/386
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.docker_meta.outputs.tags }}
          labels: ${{ steps.docker_meta.outputs.labels }}

Customizing

inputs

Following inputs can be used as step.with keys

Name	Type	Description
images	List/CSV	List of Docker images to use as base name for tags
tag-sha	Bool	Add git short SHA as Docker tag (default false)
tag-edge	String	Branch that will be tagged as edge (default ${{ repo.default_branch }}
sep-tags	String	Separator to use for tags output (default \n)
sep-labels	String	Separator to use for labels output (default \n)

List/CSV type can be a newline or comma delimited string

outputs

Following outputs are available

Name	Type	Description
tags	String	Generated Docker tags
labels	String	Generated Docker labels

Keep up-to-date with GitHub Dependabot

Since Dependabot has native GitHub Actions support, to enable it on your GitHub repo all you need to do is add the .github/dependabot.yml file:

version: 2
updates:
  # Maintain dependencies for GitHub Actions
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "daily"

How can I help?

All kinds of contributions are welcome 🙌! The most basic way to show your support is to star 🌟 the project, or to raise issues 💬 You can also support this project by becoming a sponsor on GitHub 👏 or by making a Paypal donation to ensure this journey continues indefinitely! 🚀

Thanks again for your support, it is much appreciated! 🙏

License

MIT. See LICENSE for more details.