Broader test for pre-commit repo.

Test all of the files in the repo, otherwise most (all?) hooks will not
even run.

templates/pre-commit-repo.yml

@@ -6,7 +6,7 @@ pre-commit-repo:
   variables:
     XDG_CACHE_HOME: "$CI_PROJECT_DIR/.cache"
   script:
-    - pre-commit try-repo ./
+    - pre-commit try-repo --all-files ./
   cache:
     paths:
       - .cache/