Only run lint jobs for MRs

.gitlab-ci.yml

@@ -127,9 +127,10 @@ black:
     - pip install black
   script:
     - black --check --diff .
-  only:
-    changes:
-      - api/**/*
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+      changes:
+        - api/**/*
 
 flake8:
   interruptible: true
@@ -145,9 +146,10 @@ flake8:
     key: "$CI_PROJECT_ID__flake8_pip_cache"
     paths:
       - "$PIP_CACHE_DIR"
-  only:
-    changes:
-      - api/**/*
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+      changes:
+        - api/**/*
 
 eslint:
   interruptible: true
@@ -164,9 +166,10 @@ eslint:
     key: "$CI_PROJECT_ID__eslint_npm_cache"
     paths:
       - front/node_modules
-  only:
-    changes:
-      - front/**/*
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+      changes:
+        - front/**/*
 
 test_api:
   interruptible: true