test: gate releases on mobile offline filing

Closes #863

.gitea/workflows/ci.yml

@@ -36,9 +36,28 @@ jobs:
           name: release-bundle
           path: dist/
 
+  browser-journey:
+    runs-on: ubuntu-latest
+    needs: build-release
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with: { python-version: "3.11" }
+      - name: Download assembled release bundle
+        uses: actions/download-artifact@v3
+        with:
+          name: release-bundle
+          path: dist
+      - name: Install browser test dependencies
+        run: |
+          pip install -r requirements-e2e.txt
+          python3 -m playwright install --with-deps chromium
+      - name: Exercise mobile offline filing from the release artifact
+        run: python3 -m pytest tests/e2e/test_mobile_offline_issue_release.py -q
+
   release-candidate:
     runs-on: ubuntu-latest
-    needs: [lint, build-release]
+    needs: [lint, build-release, browser-journey]
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     permissions:
       contents: write