Add a build container #3

	name: Container
	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	build-and-push:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	steps:
	- name: Log into the container registry
	uses: docker/login-action@v3
	if: github.event_name != 'pull_request'
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Setup Docker Buildx
	uses: docker/setup-buildx-action@v3
	- name: Build the container image
	uses: docker/build-push-action@v6
	with:
	platforms: linux/amd64,linux/arm64
	tags: AsahiLinux/mkdocs-asahi:latest
	push: ${{ github.event_name != 'pull_request' }}
	cache-from: type=gha
	cache-to: type=gha,mode=max
	# https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry#adding-a-description-to-multi-arch-images
	outputs: type=image,name=target,annotation-index.org.opencontainers.image.description=Build the Asahi Linux documentation website using mkdocs

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