push_docker.yaml

name: push container to ghcr.io

on:
  push:
    paths:
      - '**/Dockerfile'

jobs:
  get-container-names:
    runs-on: ubuntu-latest  # windows-latest | macos-latest
    name: Get container name
    outputs: 
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0  # OR "2" -> To retrieve the preceding commit.

      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@v23.1

      - name: Get container names
        id: set-matrix
        run: |
          JSON="{\"include\":["
          
          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do 
            if [[ $file == *"Dockerfile"* ]]; then
              name=${file%/Dockerfile}
              name=${name#*/}
              add_string="{\"container-name\": \"$name\"},"
              if [[ "$JSON" != *"$add_string"* ]]; then
                JSON="$JSON$add_string"
              fi
            fi
          done
          
          if [[ $JSON == *, ]]; then
            JSON="${JSON%?}"
          fi
          JSON="$JSON]}"
          echo "::set-output name=matrix::$( echo "$JSON" )"
          
  push-docker-image:
    needs: get-container-names
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    strategy:
      fail-fast: false
      matrix: ${{ fromJSON(needs.get-container-names.outputs.matrix) }}
    steps:
    - uses: actions/checkout@v2

    - name: Login to GitHub Container Registry
      uses: docker/login-action@v1
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Set date tag for the image
      id: date
      run: echo "DATE=$(date +'%y%m%d')" >> $GITHUB_ENV

    - name: Build and Push Docker image
      run: |
        docker build ./${{ matrix.container-name }} --tag ghcr.io/dhslab/${{ matrix.container-name }}:$DATE
        docker tag ghcr.io/dhslab/${{ matrix.container-name }}:$DATE ghcr.io/dhslab/${{ matrix.container-name }}:latest
        docker push ghcr.io/dhslab/${{ matrix.container-name }}:$DATE
        docker push ghcr.io/dhslab/${{ matrix.container-name }}:latest