ci(workflows): add gitlint.yml

Add workflow for linting Git commit messages.

.github/workflows/gitlint.yml

@@ -0,0 +1,13 @@
+# SPDX-FileCopyrightText: 2024 K Kollmann
+# SPDX-License-Identifier: MIT
+
+name: Lint Git commit messages
+
+on:
+  pull_request:
+
+jobs:
+  gitlint:
+    uses: acdh-oeaw/prosnet-workflows/.github/workflows/[email protected]
+    with:
+      basebranch: ${{ github.event.repository.default_branch }}