Cancel the previous running deployment of PR if new deployment detected

Author: piyush-jaiswal

.github/workflows/deploy_preview.yml

@@ -9,6 +9,10 @@ on:
         branches: [ "master" ]
     workflow_dispatch:
 
+concurrency:
+    group: "vercel-preview-${{ github.event.pull_request.number }}"
+    cancel-in-progress: true
+
 jobs:
     test:
         uses: ./.github/workflows/tests.yml