[actions] add `Docker publish` workflows #15

	name: Docker publish

	on:
	schedule:
	# @weekly
	- cron: "0 0 * * SUN"
	push:
	branches: ["main"]

	env:
	REGISTRY: ghcr.io
	REPO_NAME: ${{ github.repository_owner }}

	jobs:
	publish:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	id-token: write
	strategy:
	matrix:
	distro: [ubuntu]

	steps:
	# Docker build using Git context, no need to use checkout action
	# - name: Checkout repository
	# uses: actions/checkout@v4

	# Add support for more platforms with QEMU (optional)
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3

	# By default, builder driver is `docker`, which currently not supported
	# building multi-platform images or exporting cache.
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Log into ${{ env.REGISTRY }}
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract Docker metadata
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.REPO_NAME }}/${{ matrix.distro }}
	tags: \|
	type=raw,value=22.04

	- name: Docker builder info
	run: \|
	set -x
	docker buildx version
	docker buildx ls
	docker buildx inspect

	- name: Build and push Docker image
	id: publish
	uses: docker/build-push-action@v6
	with:
	context: "{{defaultContext}}:${{ matrix.distro }}"
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}
	cache-from: type=gha
	cache-to: type=gha,mode=max
	sbom: true
	provenance: true
	platforms: \|
	linux/amd64
	linux/arm64

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