Add additional triggers for builds workflow (#264)

Author: petea

.github/workflows/builds.yml

@@ -1,6 +1,11 @@
 name: Build GSI for Valid Architectures	
 
 on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
   schedule:
     - cron: '0 8 * * *' # Cron uses UTC; run at nightly at midnight PST