add concurrency config to CI

Author: mansona

.github/workflows/ci.yml

@@ -6,6 +6,10 @@ on:
       - main
   pull_request:
 
+concurrency:
+  group: ci-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 env:
   NODE_VERSION: 20
   PERCY_PARALLEL_NONCE: ${{ github.run_id }}-${{ github.run_number }}