include meta backup test in workflow

ci/workflows/pull-request.yml

@@ -121,6 +121,24 @@ steps:
     timeout_in_minutes: 8
     retry: *auto-retry
 
+  - label: "meta backup test"
+    key: "e2e-meta-backup-test"
+    command: "ci/scripts/run-meta-backup-test.sh -p ci-dev -m ci-3streaming-2serving-3fe"
+    if: |
+      build.pull_request.labels includes "ci/run-e2e-meta-backup-test"
+    depends_on:
+      - "build"
+      - "build-other"
+      - "docslt"
+    plugins:
+      - docker-compose#v5.1.0:
+          run: rw-build-env
+          config: ci/docker-compose.yml
+          mount-buildkite-agent: true
+      - ./ci/plugins/upload-failure-logs
+    timeout_in_minutes: 45
+    retry: *auto-retry
+
   - label: "end-to-end test (parallel)"
     command: "ci/scripts/e2e-test-parallel.sh -p ci-dev"
     if: |