test ci paths

.github/workflows/build_arm.yml

@@ -1,11 +1,14 @@
 name: Build ARM
 
 on:
-  pull_request:
   push:
-  release:
-    types:
-      - created
+    paths:
+      - 'src'
+      - 'examples'
+      - 'lib'
+      - 'hw'
+  pull_request:
+    branches: [ master ]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}