fix: container_registry가 main에 push될 때 실행되지 않도록 수정

.github/workflows/container_registry.yml

@@ -3,7 +3,7 @@ name: KakaoCloud Container Registry Test
 on:
   push:
     branches:
-      - main
+      - test
 jobs:
   build-and-push:
     runs-on: ubuntu-latest