ci: simplify files matching rules

Matching in addition docs/index.md, but it should be fine

Trigger pre-commit jobs when pre-commit-config.yaml changes

.gitlab-ci.yml

@@ -13,16 +13,13 @@ image: $DOCKER_IMAGE/$PYTHON_VERSION:latest
 .code_changes:
   rules:
     - changes:
-      - duniterpy/**/*.py
-      - tests/**/*.py
-      - examples/*.py
+      - "**.py"
+      - .pre-commit-config.yaml
 
 .changes:
   rules:
     - changes:
-      - duniterpy/**/*.py
-      - tests/**/*.py
-      - examples/*.py
+      - "**.py"
       - .gitlab-ci.yml
       - Makefile
       - pyproject.toml