publish-docker-image.yml

name: Publish Docker Image

on:
  release:
    types: [ published ]

env:
  # GitHub repository is basically "$org/$repo"
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
    - name: Checkout code
      uses: actions/checkout@v2

    # User triggering the action is authenticated to the container registry
    - name: Log in to the Container registry
      uses: docker/login-action@v1.10.0
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    # Basically sets the image tag from the release
    - name: Extract metadata for Docker
      id: meta
      uses: docker/metadata-action@v3.6.0
      with:
        images: ghcr.io/${{ env.IMAGE_NAME }}

    - name: Build and push Docker image
      uses: docker/build-push-action@v2.7.0
      with:
        context: .
        push: true
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}