Upload e2e output as artifact when tests fail

Author: hlomzik

.github/workflows/build.yml

@@ -40,6 +40,12 @@ jobs:
     - run: npx serve -l tcp://localhost:3000 build &
     - run: npm run test:e2e:headless
 
+    - uses: actions/upload-artifact@master
+      if: ${{ failure() }}
+      with:
+        name: e2e output
+        path: e2e/output/
+
     # upload this build as artifact to current Action
     - uses: actions/upload-artifact@master
       with: