name: Docker image build

on:
  push:
    branches: [ "main" ]
    # Publish semver tags as releases.
    paths:
      - '**.php'
      - './composer.*'
      - './config/**'
      - './.github/**'
      - 'Procfile'
      - 'project.toml'
  pull_request:
    branches: [ "main" ]

env:
    COMPOSER_AUTH: "{ \"github-oauth\": {\"github.com\": \"${{ secrets.HVG_DEV_GH_TOKEN }}\"}}"
    
jobs:
  pack-example:
    name: Pack example!
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v1
    - uses: andrioid/setup-pack@v1.0.1
    - name: Docker registry login
      uses: docker/login-action@v1
      with:
        registry: ghcr.io/hvg
        username: hvg-dev
        password: ${{ secrets.HVG_DEV_GH_TOKEN }}
    - name: Set build environment
      run: |
        year=$(date +%Y);
        month=$(date +%m);
        ref="${GITHUB_REF#refs/*/}";
        echo "REF=$ref" >> $GITHUB_ENV;
        tag="${GITHUB_REF#tags/*/}";
        [[ $tag == '' ]] || tag="${year}.${month}.${{ github.run_number }}";
        echo "TAG=$tag" >> $GITHUB_ENV;
    - name: Build Image with pack
      run: |
        pack build ghcr.io/hvg/blog:$TAG \
        --builder heroku/buildpacks:20 \
        --descriptor project.toml \
        --workspace /app \
        --env COMPOSER_AUTH=$COMPOSER_AUTH;
    - name: Tag Docker image to ref
      run: |
        docker tag ghcr.io/hvg/blog:$TAG ghcr.io/hvg/blog:$REF