ci: ensure linelint job runs only on pull_request events

Author: DaleSeo

.github/workflows/integration.yaml

@@ -7,6 +7,7 @@ on:
 jobs:
   linelint:
     runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
     steps:
       - uses: actions/checkout@v4
         with: