chore: Only run full build on pull requests (#6441)

* chore: Only run full build process on PR updates

* chore: Quick build check on push

* CR: Fix slack message based on new event type

* CR: Fix slack message for both event types

.github/workflows/build.yml

@@ -3,11 +3,15 @@ name: build
 on:
   push:
     branches:
-      - '**'
+      - 'main'
+      - 'release/**'
     tags-ignore:
       - '**'
     paths-ignore:
       - 'website/**'
+  pull_request:
+    paths-ignore:
+      - 'website/**'
   workflow_call:
   workflow_dispatch: