Run upstream tests only periodically

Signed-off-by: Shivam Sandbhor <shivam.sandbhor@gmail.com>

Author: sbs2001

.github/workflows/upstream_test.yml

@@ -1,6 +1,5 @@
 on:
   workflow_dispatch: # allow manual execution
-  push:
   schedule:
     # run on every 9 o'clock
     - cron: '0 9 * * *'