Clean up

Author: haochengxia

.github/workflows/build.yml

@@ -1,6 +1,16 @@
 name: Build
 
-on: [push, pull_request]
+on: 
+  push:
+    paths:
+      - 'src/**'
+      - 'libcachesim/**'
+      - 'tests/**'
+  pull_request:
+    paths:
+      - 'src/**'
+      - 'libcachesim/**'
+      - 'tests/**'
 
 permissions:
   contents: read