add concurrency check for standalone

Author: mahf708

.github/workflows/eamxx-gh-ci-standalone.yml

@@ -15,6 +15,10 @@ on:
 
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
 
   ci: