Add hook to check for signoff in commit messages

Since this is checked on PR, it could also be checked at commit so users can avoid making commits to
the tree without expected documentation.

Signed-off-by: Ian Fijolek <ian@iamthefij.com>

.pre-commit-config.yaml

@@ -1,3 +1,4 @@
+default_install_hook_types: [pre-commit, commit-msg]
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: v0.9.6
@@ -26,3 +27,8 @@ repos:
     rev: v2.2.5
     hooks:
     - id: codespell
+
+  - repo: https://github.com/gklein/check_signoff
+    rev: v1.0.5
+    hooks:
+      - id: check-signoff