Do not lint on scheduled jobs

.gitlab-ci.yml

@@ -29,12 +29,8 @@ lint:
     - rustup component add clippy
     - cargo clippy --all-targets -- -D warnings
   rules:
-    - if: $SCHEDULED_BUILD_PIPELINE == 'true'
-      allow_failure: true
-    - if: $SCHEDULED_BUILD_PIPELINE != 'true'
-      allow_failure: false
-
-
+    - if: "$CI_COMMIT_BRANCH != $CI_DEFAULT_BRANCH"
+    
 test:
   image: rust:latest
   stage: test