Update workflow triggers to include v3.8 branch pattern

Author: YiiGuxing

.github/workflows/build.yml

@@ -15,8 +15,7 @@ on:
   # Trigger the workflow on pushes to only the 'main' branch (this avoids duplicate checks being run e.g., for dependabot pull requests)
   push:
     branches:
-      - 'master'
-      - 'next'
+      - 'v3.8/*'
     paths-ignore:
       - '.idea/**'
       - '.run/**'