name: Create and publish a Docker image


on:
  push:
    tags: [ "*" ]

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest

    permissions:
      contents: read
      packages: write
    
    steps:
    - name: Log in to the Container registry
      uses: docker/login-action@v2
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}
    
    - name: Extract metadata (tags, labels) for Docker
      id: meta
      uses: docker/metadata-action@v3
      with:
        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
        tags: |
          type=ref,enable=true,priority=600,prefix=v,suffix=,event=tag

    - name: Set short git commit SHA
      id: vars
      run: |
        calculatedSha=$(git rev-parse --short ${{ github.sha }})
        echo "::set-output name=short_sha::$calculatedSha"

    - name: Push image
      run: |
        docker image tag ${{ steps.meta.outputs.tags }} ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.vars.outputs.short_sha }}