env-build.yaml

name: Docker automatic build and publish

on:
  push:
    branches: 
      - issue17_fix_root_env
      # - main

env:
  REGISTRY: ghcr.io

jobs:
  build-matrix-from-changed-files:
    runs-on: ubuntu-latest  # windows-latest || macos-latest
    name: Build matrix from directorues with changed files

    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 2  # "0" (OR "2" -> To retrieve the preceding commit).

      - name: Run changed-files with dir_names
        id: changed-files
        uses: tj-actions/changed-files@v37
        with:
          files_ignore: |
            .github/workflows/env-build.yaml
            **/README.md
          dir_names: "true"
          dir_names_exclude_current_dir: "true"
          
      - name: List all changed dirs and create list with unique directories
        id: set-matrix
        run: |
          environments=()
          for dir in ${{ steps.changed-files.outputs.all_changed_files }}; do
            echo "$dir was changed"
            if [[ $(echo ${environments[@]} | fgrep -w ${dir}) ]]; then
              echo " - ${dir} is in the list of changed dirs"
            else
              echo " - ${dir} is NOT in the list of changed dirs. Adding it!"
              environments+=("\"${dir}\"")
              echo " ** The update list is ${environments[@]}"
            fi        
          done

          ENVS_LIST=`echo "[${environments[@]}]" |  sed 's/ /,/g'`
          echo ::set-output name=environment_list::$ENVS_LIST

          echo "The final list is: ${ENVS_LIST}"

    outputs:
      environment_list: ${{ steps.set-matrix.outputs.environment_list }}
          
  build-and-push-image:
    needs: build-matrix-from-changed-files
    runs-on: ubuntu-latest
    strategy:
      matrix:
        environments: ${{ fromJson(needs.build-matrix-from-changed-files.outputs.environment_list) }} 

    permissions:
      contents: read
      packages: write

    steps:
      - name: Docker Checkout
        uses: actions/checkout@v3

      - name: Log in to the GH Container Registry
        id: login
        uses: docker/login-action@v2.1.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Extract metadata for ${{ matrix.environments }}
        id: meta
        uses: docker/metadata-action@v4.3.0
        with:
          flavor: |
            latest=true
          tags: |
            type=sha
          images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ matrix.environments }}

      - name: Build and push ${{ matrix.environments }}
        id: build
        uses: docker/build-push-action@v4.0.0
        with:
          context: ./${{ matrix.environments }}
          file: ./${{ matrix.environments }}/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: | 
            BUILD_DATE=$(date +'%Y-%m-%dT%H:%M:%SZ')