Add docker build CI pipeline #5

	name: Docker

	on:
	push:
	branches:
	- master
	pull_request:
	paths:
	- 'docker/Dockerfile'
	- '.github/workflows/docker.yml'
	release:
	types:
	- released

	# allow manually starting this workflow
	workflow_dispatch:

	jobs:
	build-and-push-image:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	distro: [focal, jammy]
	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}
	# Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
	permissions:
	contents: read
	packages: write
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Log in to the Container registry
	uses: docker/login-action@v1
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract Docker meta-information
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	flavor: \|
	latest=false
	prefix=
	suffix=
	tags: \|
	type=ref,event=branch,prefix=${{ matrix.distro }}-
	type=ref,event=pr,prefix=${{ matrix.distro }}-
	type=semver,pattern={{major}}.{{minor}},prefix=${{ matrix.distro }}-

	- name: Build and push Docker image
	uses: docker/build-push-action@v5
	with:
	context: $GITHUB_WORKSPACE/docker/Dockerfile
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

Provide feedback