Don't run pre-commit on scheduled builds.

There's really no point in it. I usually keep the master branch
buildable and working so running pre-commit is a waste of time and a
source for failed builds that shouldn't be.

templates/pre-commit.yml

@@ -3,6 +3,8 @@ pre-commit:
   stage: .pre
   image: registry.shore.co.il/ci-images:pre-commit
   tags: [ns4.shore.co.il]
+  rules:
+    - if: $CI_PIPELINE_SOURCE != "schedule"
   variables:
     XDG_CACHE_HOME: "$CI_PROJECT_DIR/.cache"
     SKIP: |-