Chore: ci-cd.yml 수정 - concurrency 추가

Author: lunarbae628

.github/workflows/ci-cd.yml

@@ -13,6 +13,10 @@ on:
         required: false
         default: "release"
 
+concurrency:
+  group: cicd-${{ github.ref_name }}
+  cancel-in-progress: false
+
 jobs:
   build-and-push:
     runs-on: ubuntu-latest