lighthouse.yml

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