Update e2e.yaml

.github/workflows/e2e.yaml

@@ -17,7 +17,7 @@ on:
       - main
 
   schedule:
-    - cron: '0 6 * * *' # 6 AM UTC everyday
+    - cron: '0 6 * * *' # 6 AM UTC everyday for default branch
 
 permissions:
   contents: read # for actions/checkout to fetch code
@@ -95,7 +95,7 @@ jobs:
       - name: Notify on Failure/Success
         id: slack-notification
         uses: slackapi/[email protected]
-        if: ${{ github.ref_name  == 'main' }}
+        if: ${{ github.ref_name  == 'main' && github.event_name == 'schedule' }}
         with:
           # Slack channel id, channel name, or user id to post message.
           # See also: https://api.slack.com/methods/chat.postMessage#channels