publish-docker.yml

name: Publish Docker image
# To maastrichtu-library GitHub Container Registry
# https://github.com/orgs/maastrichtu-library/packages 
on:
  workflow_dispatch:
  push:
    branches: [ main ]
    paths:
    - 'Dockerfile'
    - '.github/workflows/publish-docker.yml'
  schedule:
    - cron: '0 3 * * 1'
    # Monday at 3:00 GMT+1

env:
  IMAGE_PULLED: postgres:latest
  IMAGE_PUSHED: ghcr.io/maastrichtu-library/postgres:latest

jobs:
  publish-latest:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: Log into GitHub Container Registry
      # TODO: Create a token with `read:packages` and `write:packages` scopes 
      # And save it as an Actions secret CONTAINER_REGISTRY_GITHUB_TOKEN
        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin

      - name: Pull image from DockerHub
        run: docker pull $IMAGE_PULLED

      - name: Push image to GitHub Container Registry
        run: |
          docker tag $IMAGE_PULLED $IMAGE_PUSHED
          docker push $IMAGE_PUSHED

      # - name: Build image
      #   run: docker build . --file Dockerfile --tag $IMAGE_PUSHED