name: Publish Docker image

on: 
  push:
    branches: [master, develop]

jobs:
  publish:
    name: Publish Image
    runs-on: ubuntu-latest
    steps:
    - id: repository
      uses: ASzc/change-string-case-action@v1
      with:
        string: "${{ github.repository }}/${{ github.event.repository.name }}" 
    - uses: actions/checkout@v2
    - name: Preparation
      id: prep
      run: |
        REGISTRY="ghcr.io"
        IMAGE="${REGISTRY}/${{ steps.repository.outputs.lowercase }}"
        TAGS="${IMAGE}:${{ github.sha }}"
        if [[ $GITHUB_REF == ref/head/master ]]; then
          TAGS="${TAGS},${IMAGE}:latest"
        fi
        echo ::set-output name=tags::${TAGS}
    - name: Login in to registry
      uses: docker/login-action@v1
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ github.token }}
    - name: Push to registry
      uses: docker/build-push-action@v2
      with:
        push: true
        file: ./Docker/Dockerfile
        tags: ${{ steps.prep.outputs.tags }}