teddit/.github/workflows/update-image-on-push.yml

name: "Update Image and Push to Github Packages and Docker Hub when Dockerfile is changed"
# Run this workflow every time a new commit pushed to your repository
on:
  push:
jobs:
  rebuild-container:
    name: "Rebuild Container with the latest base image"
    runs-on: ubuntu-latest
    steps:
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Login to GitHub Container Registry
        uses: docker/login-action@v1 
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        name: Login to DockerHub
        uses: docker/login-action@v1 
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      - name: "Checkout repository"
        uses: "actions/checkout@v2"
      -
        name: Build and push to Docker Hub and Github Packages Docker Registry
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: |
            ghcr.io/${{ github.repository_owner }}/teddit:latest
            ${{ secrets.DOCKER_USERNAME }}/teddit:latest            
          labels: |
            org.opencontainers.image.source=${{ github.event.repository.html_url }}
            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
            org.opencontainers.image.revision=${{ github.sha }}            
          cache-from: type=registry,ref=${{ secrets.DOCKER_USERNAME }}/teddit:latest
          cache-to: type=inline
      -
        name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}