ci: add commit message validation hook

.commitlintrc.js

@@ -0,0 +1,3 @@
+module.exports = {
+    extends: ['@commitlint/config-conventional']
+};

.pre-commit-config.yaml

@@ -8,4 +8,10 @@ repos:
     rev: v0.8.4
     hooks:
       - id: ruff
-      - id: ruff-format
+      - id: ruff-format
+  - repo: https://github.com/alessandrojcm/commitlint-pre-commit-hook
+    rev: v9.20.0
+    hooks:
+      - id: commitlint
+        stages: [commit-msg]
+        additional_dependencies: ['@commitlint/config-conventional']

CONTRIBUTING.rst

@@ -5,6 +5,7 @@ Contributing to trame
 #. Clone the repository using ``git clone``
 #. Install pre-commit via ``pip install pre-commit``
 #. Run ``pre-commit install`` to set up pre-commit hooks
+#. Run ``pre-commit install --hook-type commit-msg`` to register commit-msg hook
 #. Make changes to the code, and commit your changes to a separate branch
 #. Create a fork of the repository on GitHub
 #. Push your branch to your fork, and open a pull request