add manual trigger

Author: ezhang6811

.github/workflows/nightly-build.yml

@@ -5,6 +5,9 @@ on:
   schedule:
     - cron: "21 3 * * *"
   workflow_dispatch:
+  push:
+    branches:
+      - zhaez/nightly-build
 
 env:
   AWS_DEFAULT_REGION: us-east-1