modify workflow

Author: vinlee19

.github/workflows/build-connector.yml

@@ -22,13 +22,15 @@ on:
     workflows: [ "Code Style Checker" ]
     types:
       - completed
+    branches:
+      - 'master'
   pull_request:
   push:
 
 jobs:
   build-extension:
     name: "Build Connector"
-    if: ${{ github.event_name == 'push' || github.event.workflow_run.conclusion == 'success' }}
+    if: (github.event_name == 'push') || (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success')
     runs-on: ubuntu-latest
     defaults:
       run: