[enh] #162: Introduce gitlab-ci-linter pre-commit hook

Set to git.duniter.org to not request gitlab.com API

.pre-commit-config.yaml

@@ -27,3 +27,10 @@ repos:
         args:
         - --license-filepath
         - license_header.txt
+-   repo: https://gitlab.com/devopshq/gitlab-ci-linter
+    rev: v1.0.3
+    hooks:
+    - id: gitlab-ci-linter
+      args:
+        - "--server"
+        - "https://git.duniter.org"