SEO audit #12

	name: SEO audit

	on:
	pull_request:
	branches:
	- master
	schedule:
	# Mondays at 06:00 UTC. Search engines change what they reward without any
	# commit on our side, so the audit runs on a timer as well as per change.
	- cron: "0 6 * * 1"
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	lighthouse:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

	- name: Set up Ruby
	uses: ruby/setup-ruby@44511735964dcb71245e7e55f72539531f7bc0eb # v1.257.0
	with:
	ruby-version: "3.2.0"
	bundler-cache: true

	# Built exactly as pages.yml builds it. A development build has no
	# site.url, which leaves rel=canonical relative and robots.txt without a
	# sitemap line, and Lighthouse fails both of those on a site that is
	# actually fine in production.
	- name: Build site
	env:
	JEKYLL_ENV: production
	run: bundle exec jekyll build --config _config.yml,_config_production.yml

	- name: Set up Node
	uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
	with:
	node-version: "22"

	- name: Run Lighthouse CI
	run: npx --yes @lhci/cli@0.14.x autorun --config=.lighthouserc.json

	- name: Upload Lighthouse reports
	if: always()
	uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
	with:
	name: lighthouse-reports
	path: .lighthouseci/
	retention-days: 30

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