ci: Add gitlint

.github/workflows/build.yml

@@ -59,6 +59,13 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          fetch-depth: '0'
+      - name: Install gitlint
+        run: |
+          pip install gitlint==0.19.1
+      - name: Run gitlint
+        run: gitlint --commits d789f61044e63e1a00d8e9f1d4d49c8d9ffc42a9..HEAD
       - name: Install REUSE
         run: |
           pip install reuse==4.0.3

.gitlint

@@ -0,0 +1,10 @@
+# SPDX-FileCopyrightText: Copyright (C) swift Project Community / Contributors
+# SPDX-License-Identifier: CC0-1.0
+
+[general]
+ignore=B6,B7
+contrib=contrib-title-conventional-commits
+
+### Configuring rules ###
+[title-max-length]
+line-length=100