ci: add docker-release.yml #1

	name: Docker

	on:
	push:
	tags:
	- v*

	env:
	IMAGE_NAME: ghcr.io/${{ github.repository }}
	IMAGE_SOURCE: https://github.com/${{ github.repository }}

	jobs:
	# Push image to GitHub Packages.
	push:
	runs-on: ubuntu-latest
	if: github.event_name == 'push'

	steps:
	- uses: actions/checkout@v3

	- name: Build image
	run: \|
	docker build . \
	--label "org.opencontainers.image.source=${IMAGE_SOURCE}" \
	--label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
	--label "org.opencontainers.image.version=$(git describe --tags --abbrev=0)" \
	--label "org.opencontainers.image.licenses=AGPL-3.0" \
	-f ./Dockerfile -t "${IMAGE_NAME}"

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

	- name: Push image
	run: \|
	# Strip git ref prefix from version
	VERSION=$(echo "${{ github.ref }}" \| sed -e 's,./$.$,\1,')
	# Strip "v" prefix from tag name
	[[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION \| sed -e 's/^v//')
	# Use Docker `latest` tag convention
	[ "$VERSION" == "master" ] && VERSION=latest
	echo IMAGE_NAME=$IMAGE_NAME
	echo VERSION=$VERSION
	docker tag $IMAGE_NAME $IMAGE_NAME:$VERSION
	docker tag $IMAGE_NAME $IMAGE_NAME:latest
	docker push $IMAGE_NAME:$VERSION
	docker push $IMAGE_NAME:latest

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