Build only on push or pull to master

.github/workflows/integration.yaml

@@ -1,7 +1,13 @@
 name: Integration
 
 # Run this workflow every time a new commit pushed to your repository
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
   # Set the job key. The key is displayed as the job name