NRL-716 Fix destroy action (#613)

Author: eesa456

.github/workflows/pr-env-destroy.yml

@@ -88,8 +88,8 @@ jobs:
 
       - name: Cleanup Terraform Workspace
         run: |
-          terraform workspace select default
-          terraform workspace delete ${{ needs.set-environment-id.outputs.environment_id }}
+          terraform -chdir=terraform/infrastructure workspace select default
+          terraform -chdir=terraform/infrastructure workspace delete ${{ needs.set-environment-id.outputs.environment_id }}
 
       - name: Add Failure Pull Request Comment
         uses: actions/github-script@v7