build_test_containers.yml

name: Docker

on:
  pull_request:
    paths:
    - .github/workflows/build_test_containers.yml
    - ansible/docker/test/Dockerfile*
    branches:
    - master
  push:
    paths:
    - .github/workflows/build_test_containers.yml
    - ansible/docker/test/Dockerfile*
    branches:
    - master

permissions:
  contents: read
  packages: write

jobs:
    generate-matrix:
        name: Generate Matrix
        runs-on: ubuntu-latest
        if: github.repository_owner == 'adoptium'
        outputs:
            matrix: ${{ steps.generate_matrix.outputs.matrix }}
        steps:
            - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
              with:
                fetch-depth: 0

            # Get list of changed files in ansible/docker/test/Dockerfile*
            - name: Get list of changed Dockerfiles
              id: get_changed_files
              run: |
                if [ ${{ github.event_name }} == "push" ]; then
                    changed_files=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep ansible/docker/test/Dockerfile)
                else
                    changed_files=$(git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }} | grep ansible/docker/test/Dockerfile)
                fi
                echo "changed_files=$changed_files" >> "$GITHUB_ENV"

            # Generate matrix
            - name: Generate matrix
              id: generate_matrix
              run: |
                matrix=$(jq -n --arg files "${changed_files}" '{
                  "include": ($files | split("\n") | map(select(length > 0) | {dockerfile: .}))
                }')
                echo "matrix<<EOF"$'\n'"$matrix"$'\n'EOF >> $GITHUB_OUTPUT

    build-dockerfiles:
        name: Build Dockerfiles
        runs-on: ubuntu-latest
        needs: generate-matrix
        strategy:
            matrix: ${{fromJson(needs.generate-matrix.outputs.matrix)}}
        steps:
            - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7

            # Generate tag name based on the Dockerfile name
            - name: Set tag name
              run: echo "TAG_NAME=$(basename ${{ matrix.dockerfile }} | cut -d'.' -f2 | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV

            - name: Build Dockerfile
              run: docker build -t ghcr.io/${{ github.repository_owner }}/test-containers:$TAG_NAME -f ${{ matrix.dockerfile }} .

            - name: Push Dockerfile to ghcr.io
              if: github.event_name == 'push'
              run: |
                echo ${{ secrets.GITHUB_TOKEN }} | docker login ghcr.io -u ${{ github.repository_owner }} --password-stdin
                docker push ghcr.io/${{ github.repository_owner }}/test-containers:$TAG_NAME