update build push trigger to run only on main

Author: faogustavo

.github/workflows/build.yml

@@ -2,11 +2,9 @@ name: build
 on:
   workflow_dispatch:
   pull_request:
-    branches:
-      - "**"
   push:
     branches:
-      - "**"
+      - main
 
 jobs:
   build: