Add optional Docker deployment for self-hosting (#115) #1

	name: Docker image

	# Build-only. Nothing is published, so this adds no release surface or
	# registry credentials — it exists so the Dockerfile cannot silently rot.
	on:
	push:
	branches: [main]
	paths:
	- 'docker/**'
	- '.dockerignore'
	- 'xtask/**'
	- '**/book.toml'
	- '.github/workflows/docker.yml'
	pull_request:
	paths:
	- 'docker/**'
	- '.dockerignore'
	- 'xtask/**'
	- '**/book.toml'
	- '.github/workflows/docker.yml'
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: docker/setup-buildx-action@v3

	- name: Build image
	uses: docker/build-push-action@v6
	with:
	context: .
	file: docker/Dockerfile
	push: false
	load: true
	tags: rust-training:ci
	cache-from: type=gha
	cache-to: type=gha,mode=max

	- name: Smoke test
	run: \|
	docker run -d --name books -p 3000:8080 rust-training:ci
	for i in $(seq 1 30); do
	if curl -fsS http://localhost:3000/ >/dev/null 2>&1; then ok=1; break; fi
	sleep 2
	done
	if [ "${ok:-0}" != "1" ]; then
	echo "::error::server did not come up"; docker logs books; exit 1
	fi
	# Landing page and at least one book must resolve.
	# NB: match the <title>; the <h1> is split by a <span> tag.
	curl -fsS http://localhost:3000/ \| grep -q "<title>Rust Training Books</title>"
	curl -fsS -o /dev/null -w '%{http_code}\n' http://localhost:3000/async-book/ \| grep -q 200
	# Extensionless links must resolve via try_files.
	curl -fsS -o /dev/null -w '%{http_code}\n' http://localhost:3000/async-book/ch00-introduction \| grep -q 200
	docker rm -f books

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