docker-publish.yml

name: build_and_publish
on:
  push:
    branches-ignore:
      # prevent building on commits to any branch
      - '**'
    tags:
      # Build on every tag:
      - '**'
  pull_request:

jobs:
  login-build-and-push:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to the GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        if: contains(github.ref, 'refs/tags/')
        name: Build and push release image
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: |
            ghcr.io/${{ github.repository_owner }}/ci-php:latest
            ghcr.io/${{ github.repository_owner }}/ci-php:${{ github.ref_name }}
      -
        if: contains(github.ref, 'refs/pull/')
        name: Build and push pull request image
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: |
            ghcr.io/${{ github.repository_owner }}/ci-php:review-pr-${{ github.event.pull_request.number }}-${{ github.head_ref }}
      -
        # not used / triggered at the moment:
        if: contains(github.ref, 'refs/heads/')
        name: Build and push the feature branch image
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: |
            ghcr.io/${{ github.repository_owner }}/ci-php:${{ github.ref_name }}