Move lighthouse to a separate job.

.github/workflows/firebase-hosting-pull-request.yml

@@ -1,12 +1,11 @@
-# This file was auto-generated by the Firebase CLI
-# https://github.com/firebase/firebase-tools
-
-name: Deploy to Firebase Hosting on PR
+name: Build and deploy to preview environment, run tests
 'on': pull_request
 jobs:
-  build_and_preview:
+  build_and_deploy:
     if: '${{ github.event.pull_request.head.repo.full_name == github.repository }}'
     runs-on: ubuntu-latest
+    outputs:
+      urls: ${{ steps.urls.outputs.urls }}
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
@@ -48,11 +47,16 @@ jobs:
               urls.push(`${{ steps.deploy.outputs.details_url }}${page}`);
             });
             core.setOutput('urls', urls.join('\n'));
+  lighthouse:
+    needs:
+      - build_and_deploy
+    runs-on: ubuntu-latest
+    steps:
       - name: Lighthouse CI Action
         id: lighthouse
         uses: treosh/lighthouse-ci-action@v8
         with:
           temporaryPublicStorage: true
           configPath: ./.lighthouserc.yml
           urls: |
-            ${{ steps.urls.outputs.urls }}
+            ${{ steps.urls.outputs.urls }}