updated terraform yaml.

Author: rahul-infra

.github/workflows/terraform.yaml

@@ -22,6 +22,7 @@ permissions:
 jobs:
   prTitlecheck:
     name: PR title check
+    if: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref == 'main' }}
     uses: ./.github/workflows/pr-title.yaml
 
   releasePreview: