Tests - initial version.

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+env:
+  RUST_BACKTRACE: 1
+  CARGO_TERM_COLOR: always
+
+jobs:
+  run-on-patch-change:
+    name: Test without semver violation
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          repository: 'mgr0dzicki/cargo-semver-action-ref-slice@patch_change'
+          persist-credentials: true
+      - name: Run action
+        uses: ${{ github.repository }}
+  run-on-major-change:
+    name: Test with semver violation
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          repository: 'mgr0dzicki/cargo-semver-action-ref-slice@major_change'
+          persist-credentials: true
+      - name: Run action
+        id: action
+        uses: ${{ github.repository }}
+        continue-on-error: true
+      - name: Check if the action failed
+        if: steps.action.outcome != 'failure'
+        run: exit 1