Run MacOS smoke test on daily cron job instead of every commit (#37567)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

.github/workflows/macos-smoke-test.yml

@@ -1,9 +1,9 @@
 name: macOS Apple Silicon Smoke Test
 
 on:
-  push:
-    branches:
-      - main
+  schedule:
+    # Daily at 2:30 AM UTC
+    - cron: '30 2 * * *'
   workflow_dispatch:  # Manual trigger
 
 permissions: