feat: add stage release worker (#1759)

#1613

---------

Signed-off-by: Kaiqi Zheng <[email protected]>

Author: catchyzheng

infra/prod/stage-release-worker.yaml

@@ -0,0 +1,29 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# This runs the `librarian release init` command with a provided repository,
+# secret name, and optional library ID
+steps:
+  - name: golang:1.24.4
+    id: stage-release-dispatcher
+    entrypoint: go
+    args:
+      - 'run'
+      - './cmd/automation'
+      - '--project=$PROJECT_ID'
+      - '--command=stage-release'
+tags: ['stage-release-dispatcher']
+availableSecrets:
+options:
+  logging: CLOUD_LOGGING_ONLY