fix: make prod deploy workflow dispatch-safe

Signed-off-by: betterclever <paliwal.pranjal83@gmail.com>

Author: betterclever

.github/workflows/deploy-prod.yml

@@ -191,7 +191,7 @@ jobs:
 
     steps:
       - name: Notify Slack
-        if: ${{ secrets.SLACK_WEBHOOK_URL != '' }}
+        if: ${{ env.SLACK_WEBHOOK_URL != '' }}
         uses: slackapi/slack-github-action@v1
         with:
           payload: |