Upload screenshots after failure

Author: hansthen

.github/workflows/test_playwright.yml

@@ -52,3 +52,10 @@ jobs:
       with:
         path: test-results.xml
         fail-on-empty: false
+
+    - name: Upload screenshots
+      if: failure()
+      uses: actions/upload-artifact@v4
+      with:
+        name: screenshots
+        path: /tmp/screenshot_*_*.png