added concurrency back

Author: robgruen

.github/workflows/ci.yml

@@ -11,9 +11,9 @@ on:
   #   branches: [ "main" ]
   workflow_dispatch:     # manual run
 
-#concurrency:
-#  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
-#  cancel-in-progress: true  
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true  
 
 permissions:
   pull-requests: read