ci: cut Docker build time via three-layer caching + scoped make target #162

	name: Build docker image for a PR

	on:
	pull_request:
	paths-ignore:
	- 'documentation/**'
	- '**.md'

	jobs:
	build:
	name: Build and push Docker image to Docker Hub
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	with:
	submodules: recursive

	# setup-buildx-action is required for advanced cache features
	# (cache-from / cache-to with type=gha and mode=max).
	- uses: docker/setup-buildx-action@v3

	- uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_PASSWORD }}

	# Cache scope is keyed on the PR's base branch so all PRs targeting
	# master share one warm-cache pool, while PRs against release branches
	# cannot poison master's cache. mode=max is required for BuildKit to
	# also export the contents of named --mount=type=cache directories
	# (notably /root/.ccache) across CI runs.
	- uses: docker/build-push-action@v6
	with:
	context: .
	file: ./share/vizd/docker/Dockerfile-production
	push: true
	tags: vizblockchain/vizd:${{ github.head_ref }}
	cache-from: type=gha,scope=pr-${{ github.event.pull_request.base_ref }}
	cache-to: type=gha,scope=pr-${{ github.event.pull_request.base_ref }},mode=max

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