docker-publish.yml

# This workflow uses actions that are not certified by GitHub.
# They are provided by a third-party and are governed by
# separate terms of service, privacy policy, and support
# documentation.

name: Publish Docker image

on:
  # For every new published release, build the docker image and publish it to GH
  release:
    types: [published]

  # For every push to master, build the docker image and publish it to GH
  push:
    branches: 
      - master

jobs:
  publish_docker_image:
    name: Push Docker image to Github Container Registry
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
    steps:
      - name: Check out the repo
        uses: actions/checkout@v2
      
      - name: Log in to the Github Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Extract metadata (tags, labels) for Docker Image
        id: meta
        uses: docker/metadata-action@v2
        with:
          images: |
            ghcr.io/${{ github.repository }}
      
      - name: Build and push Docker image
        uses: docker/build-push-action@v2
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}