[pipeline] Use GHA workflow triggers to run labeler workflow (apache#4274)

Author: yuxiqian

.github/workflows/label.yml

@@ -16,26 +16,38 @@
 # This workflow will triage pull requests and apply a label based on the
 # paths that are modified in the pull request.
 #
-# To use this workflow, you will need to set up a .github/label.yml
+# To use this workflow, you will need to set up a .github/labeler.yml
 # file with configuration.  For more information, see:
 # https://github.com/actions/labeler
 
 name: Labeler
+
 on:
-  pull_request:
-    branches:
-      - master
-      - release-*
+  workflow_run:
+    workflows: [Labeler-Trigger]
+    types: [requested]
+
+permissions:
+  checks: write
+  contents: read
+  pull-requests: write
 
 jobs:
   label:
-
     runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      pull-requests: write
-
     steps:
+      - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+          submodules: recursive
+      - name: "Get information about the original trigger of the run"
+        uses: ./.github/actions/get-workflow-origin
+        id: source-run-info
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          sourceRunId: ${{ github.event.workflow_run.id }}
       - uses: actions/labeler@v6
         with:
-          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          pr-number: ${{ steps.source-run-info.outputs.pullRequestNumber }}

.github/workflows/label_trigger.yml

@@ -0,0 +1,28 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
+name: Labeler-Trigger
+on:
+  pull_request:
+    branches:
+      - master
+      - release-*
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Do nothing. Just triggers corresponding workflow."
+        run: echo