Create workflow to trigger platform subtree pull

Author: chewy-zlai

.github/workflows/trigger_platform_subtree_pull.yaml

@@ -0,0 +1,10 @@
+name: Trigger Subtree Update in Platform
+
+on:
+  push:
+    branches: [ main ]  # Run when changes land in chronon's main
+
+jobs:
+  trigger-subtree-pull:
+    uses: zipline-ai/platform/.github/workflows/subtree_pull_reusable.yaml@main
+    secrets: inherit  # Passes all secrets (needed for the deploy key)