Create the dockerfle and git action command #1

	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

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