feat: have ci capture capybara screenshots and lighthouse results in rspec output artifact (#624)

The newest version of [`lighthouse-matchers` has audit results written
to disk](ackama/lighthouse-matchers#68) to make
it easier to debug why a score was lower than expected, so this has our
standard CI capture those in the rspec output artifacts, along with
capybara screenshots

Author: G-Rath

variants/accessibility/spec/rails_helper.rb

@@ -10,5 +10,6 @@
     # Lighthouse Matcher options
     options.add_argument("--remote-debugging-port=9222")
     Lighthouse::Matchers.chrome_flags = %w[headless=new no-sandbox]
+    Lighthouse::Matchers.results_directory = Rails.root.join("tmp/lighthouse")
   OPTIONS
 end

variants/github_actions_ci/workflows/ci.yml.tt

@@ -117,8 +117,11 @@ jobs:
         uses: actions/upload-artifact@v4
         if: success() || failure()
         with:
-          name: rspec-output-screenshots
-          path: tmp/screenshots
+          name: rspec-output-results
+          path: |
+            tmp/capybara
+            tmp/screenshots
+            tmp/lighthouse
           retention-days: 5
 
   # ACTION REQUIRED: