Add GHA to publish docker image #2

	name: "Build and publish container image"

	on:
	push:
	branches:
	- "main"
	# TODO: remove. This is for testing purposes.
	- "add-gha-for-docker-image"
	tags:
	- "v[0-9]+.[0-9]+.[0-9]+*"

	jobs:
	build-and-release-image:
	name: "Build and release container image"
	runs-on: "ubuntu-latest"
	env:
	IMAGE_NAME: "ogdc-runner"
	# GitHub Actions expressions don't have great conditional support, so
	# writing a ternary expression looks a lot like bash. In Python, this
	# would read as:
	# github.ref_name if github.ref_type == 'tag' else 'latest'
	# https://docs.github.com/en/actions/learn-github-actions/expressions
	IMAGE_TAG:
	"${{ github.ref_type == 'tag' && github.ref_name \|\| 'latest' }}"
	steps:
	- name: "Check out repository"
	uses: "actions/checkout@v3"

	- name: "Build container image"
	run: \|
	docker build --tag "ghcr.io/qgreenland-net/${IMAGE_NAME}:${IMAGE_TAG}" .

	- name: "GHCR login"
	uses: "docker/login-action@v2"
	with:
	registry: "ghcr.io"
	username: "${{ github.repository_owner }}"
	password: "${{ secrets.GITHUB_TOKEN }}"

	- name: "Push to image registries (DockerHub, GHCR)"
	run: \|
	# Push to GHCR
	docker push "ghcr.io/qgreenland-net/${IMAGE_NAME}:${IMAGE_TAG}"

	# Re-tag image and push to GHCR
	docker tag "${IMAGE_NAME}:${IMAGE_TAG}" "ghcr.io/${IMAGE_NAME}:${IMAGE_TAG}"
	docker push "ghcr.io/${IMAGE_NAME}:${IMAGE_TAG}"

	# TODO: quay.io?
	# docker tag "${IMAGE_NAME}:${IMAGE_TAG}" "quay.io/${IMAGE_NAME}:${IMAGE_TAG}"
	# docker push "quay.io/${IMAGE_NAME}:${IMAGE_TAG}"

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