chore(ci): run release workflow once per day (openai#978)

Author: stainless-bot

.github/workflows/create-releases.yml

@@ -1,5 +1,7 @@
 name: Create releases
 on:
+  schedule:
+    - cron: '0 5 * * *' # every day at 5am UTC
   push:
     branches:
       - main