feat: support deploy worker with UI assets (#627)

.github/workflows/backend_deploy.yaml

@@ -32,6 +32,14 @@ jobs:
 
       - name: Deploy Backend for ${{ github.ref_name }}
         run: |
+          export use_worker_assets=${{ secrets.USE_WORKER_ASSETS }}
+          if [ -n "$use_worker_assets" ]; then
+            cd frontend/
+            pnpm install --no-frozen-lockfile
+            pnpm build:pages
+            cd ..
+          fi
+
           export debug_mode=${{ secrets.DEBUG_MODE }}
           export use_mail_wasm_parser=${{ secrets.BACKEND_USE_MAIL_WASM_PARSER }}
           cd worker/