docker-image.yml

name: Docker

on:
  schedule:
    - cron: '24 9 * * *'
  push:
    branches: [ "main" ]
    # Publish semver tags as releases.
    tags: [ 'v*.*.*' ]
  pull_request:
    branches: [ "main" ]

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        php-version: [ '8.2', '8.3', '8.4', '8.5' ] # PHP versions to build

    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v6

      # Cache does not like upercase
      - name: Compute lowercase image name
        run: echo "IMAGE_NAME_LC=${GITHUB_REPOSITORY,,}" >> "$GITHUB_ENV"

      # Install the cosign tool except on PR
      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@cad07c2e89fa2edd6e2d7bab4c1aa38e53f76003 #v4.1.1
        with:
          cosign-release: 'v2.2.4'

      # Set up BuildKit Docker container builder
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4.0.0

      # Login against a Docker registry except on PR
      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4.1.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf # v6.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            ${{ matrix.php-version }}-${{ github.sha }}
            ${{ matrix.php-version }}-latest
            ${{ matrix.php-version }}

      # Build and push Docker image with Buildx (don't push on PR)
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@bcafcacb16a39f128d818304e6c9c0c18556b85f # v7.1.0
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=registry,ref=ghcr.io/${{ env.IMAGE_NAME_LC }}:buildcache-${{ matrix.php-version }}
          cache-to: ${{ github.event_name != 'pull_request' && format('type=registry,ref=ghcr.io/{0}:buildcache-{1},mode=max,image-manifest=true,oci-mediatypes=true', env.IMAGE_NAME_LC, matrix.php-version) || '' }}
          build-args: |
            PHP_VERSION=${{ matrix.php-version }}

      # Sign the resulting Docker image digest except on PRs.
      - name: Sign the published Docker image
        if: ${{ github.event_name != 'pull_request' }}
        env:
          TAGS: ${{ steps.meta.outputs.tags }}
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}