[CELEBORN-2328] Auto-apply correctness label from PR template checkbox

.github/PULL_REQUEST_TEMPLATE.md

@@ -16,7 +16,8 @@ Thanks for sending a pull request!  Here are some tips for you:
 
 ### Does this PR resolve a correctness bug?
 
-<!-- Yes/No. (Note: If yes, committer will add `correctness` label to current pull request). -->
+<!-- Check if yes. The `correctness` label will be added/removed automatically. -->
+- [ ] Yes
 
 ### Does this PR introduce _any_ user-facing change?
 

.github/workflows/correctness-label.yml

@@ -0,0 +1,49 @@
+#
+# 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: Correctness Label
+
+on:
+  pull_request_target:
+    types: [opened, edited, synchronize]
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Apply or remove correctness label
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_BODY: ${{ github.event.pull_request.body }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REPO: ${{ github.repository }}
+        run: |
+          # Extract only the correctness section (up to the next ### heading).
+          # PR_BODY is passed via env so it never touches the shell command string.
+          section=$(printf '%s' "$PR_BODY" | awk '
+            /Does this PR resolve a correctness bug/ { found=1 }
+            found && /^###/ && !/Does this PR resolve/ { exit }
+            found { print }
+          ')
+          if printf '%s' "$section" | grep -iqE -- '^\s*-\s*\[\s*[xX]\s*\]\s*yes\s*$'; then
+            gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "correctness"
+          else
+            gh pr edit "$PR_NUMBER" --repo "$REPO" --remove-label "correctness" 2>/dev/null || true
+          fi