CI: check PR title (bloomberg#429)

Signed-off-by: Evgeny Malygin <[email protected]>

.github/workflows/ext/check_pr_title.py

@@ -0,0 +1,56 @@
+# Copyright 2024 Bloomberg Finance L.P.
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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.
+
+"""
+Script for checking PR title.
+The script expects PR_TITLE environment variable to be set as an input parameter.
+Usage:
+export PR_TITLE="<...>"
+python3 check_pr_title.py
+"""
+import os
+
+
+def check_pr_title():
+    title = os.environ.get("PR_TITLE")
+    if title is None or len(title) == 0:
+        raise RuntimeError(
+            "This script expects a non-empty environment variable PR_TITLE set"
+        )
+    title = title.lower()
+    valid_prefixes = [
+        "fix",
+        "feat",
+        "perf",
+        "ci",
+        "build",
+        "revert",
+        "ut",
+        "it",
+        "doc",
+        "refactor",
+        "misc",
+        "test",
+    ]
+    if not any(title.startswith(prefix.lower()) for prefix in valid_prefixes):
+        raise RuntimeError(
+            'PR title "{}" doesn\'t start with a valid prefix, allowed prefixes: {}'.format(
+                title, " ".join(valid_prefixes)
+            )
+        )
+
+
+if __name__ == "__main__":
+    check_pr_title()

.github/workflows/pr-title-check.yaml

@@ -0,0 +1,25 @@
+name: PR title check
+
+on:
+  pull_request:
+    types:
+      - "opened"
+      - "reopened"
+      - "synchronize"
+      - "labeled"
+      - "unlabeled"
+      - "edited"
+
+jobs:
+  pr_title_check:
+    runs-on: ubuntu-latest
+    name: PR Title Check
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: pr title check
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          python3 ${{ github.workspace }}/.github/workflows/ext/check_pr_title.py