set up github pages to move from netlify #3

	name: PR Build Check & Preview

	on:
	pull_request:
	types: [opened, synchronize, reopened, closed]

	permissions:
	contents: write
	pull-requests: write

	concurrency:
	group: pr-preview-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	build-and-preview:
	if: github.event.action != 'closed'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-node@v4
	with:
	node-version: 20
	cache: npm

	- run: npm ci

	- run: npx myst build --html

	- run: node scripts/generate-feed.js

	- run: npx linkinator ./_build/html/

	- name: Accessibility check
	# pa11y-ci needs a running server to crawl the built site
	run: \|
	npx serve _build/html -p 4117 &
	SERVER_PID=$!
	# Ensure the server is killed even if pa11y-ci fails, so the
	# background process doesn't linger until the job times out.
	trap "kill $SERVER_PID" EXIT
	# Wait for server to be ready (more reliable than a fixed sleep)
	timeout 30 bash -c 'until curl -s http://localhost:4117 > /dev/null; do sleep 1; done'
	npx pa11y-ci --sitemap http://localhost:4117/sitemap.xml \
	--sitemap-find 'http://localhost:[0-9]+' \
	--sitemap-replace 'http://localhost:4117'

	# continue-on-error because fork PRs don't have write access to push
	# the preview to gh-pages. The build check above still validates the PR.
	- uses: rossjrw/pr-preview-action@v1
	continue-on-error: true
	with:
	source-dir: _build/html

	cleanup:
	if: github.event.action == 'closed'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: rossjrw/pr-preview-action@v1

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