Create and publish a Docker image #1128

	# Source: https://docs.github.com/en/actions/publishing-packages/publishing-docker-images

	name: Create and publish a Docker image
	on:
	push:
	branches:
	- "master"
	schedule:
	- cron: "0 2 * * *" # later than gap-docker-base
	workflow_dispatch:

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}

	jobs:
	build-and-push-image:
	runs-on: ubuntu-latest

	steps:
	# keep workflow active even if repository has no activity for 60 days
	- run: 'curl --fail -X PUT -H "Accept: application/vnd.github.v3+json" -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" https://api.github.com/repos/$GITHUB_REPOSITORY/actions/workflows/Publish.yml/enable'

	- name: Checkout repository
	uses: actions/checkout@v3

	- name: Log in to the Container registry
	uses: docker/login-action@v2
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build and push Docker image
	uses: docker/build-push-action@v3
	with:
	context: .
	push: true
	tags: "ghcr.io/${{ github.repository }}:latest"

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