minor: Only trigger PR title checker on pull requests

.github/workflows/pr_build.yml

@@ -188,18 +188,3 @@ jobs:
         with:
           MAVEN_OPTS: -Pspark-${{ matrix.spark-version }}
 
-  check-pr-title:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Check PR title
-        env:
-          PR_TITLE: ${{ github.event.pull_request.title }}
-        run: |
-          if ! echo $PR_TITLE | grep -Eq '^(\w+)(\(.+\))?: .+$'; then
-            echo "PR title does not follow conventional commit style."
-            echo "Please use a title in the format: type: message, or type(scope): message"
-            echo "Example: feat: Add support for sort-merge join"
-            exit 1
-          fi
-

.github/workflows/pr_title_check.yml

@@ -0,0 +1,43 @@
+# 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: Check PR Title
+
+concurrency:
+  group: ${{ github.repository }}-${{ github.head_ref || github.sha }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+    types: [opened, edited, reopened]
+
+jobs:
+  check-pr-title:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check PR title
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          if ! echo $PR_TITLE | grep -Eq '^(\w+)(\(.+\))?: .+$'; then
+            echo "PR title does not follow conventional commit style."
+            echo "Please use a title in the format: type: message, or type(scope): message"
+            echo "Example: feat: Add support for sort-merge join"
+            exit 1
+          fi
+