Add push-trigger filter for only main and release branches to ci build.

Author: James Blair

.github/workflows/ci_build.yml

@@ -3,6 +3,9 @@ name: build
 on:
   workflow_dispatch:
   push:
+    branches:
+    - main
+    - 'releases/**'
   pull_request:
     branches: [ main ]
     paths: