fix: Zookeeper healthcheck 수정 (srvr 4LW 명령어 사용)

ruok 명령어가 기본 비활성화된 Confluent cp-zookeeper 7.6.0에서
srvr 명령어 기반 healthcheck로 변경합니다.

Author: mrangjw

docker-compose.yml

@@ -58,11 +58,12 @@ services:
     environment:
       ZOOKEEPER_CLIENT_PORT: 2181
       ZOOKEEPER_TICK_TIME: 2000
+      KAFKA_OPTS: "-Dzookeeper.4lw.commands.whitelist=ruok,srvr,stat"
     volumes:
       - zookeeper-data:/var/lib/zookeeper/data
       - zookeeper-logs:/var/lib/zookeeper/log
     healthcheck:
-      test: ["CMD-SHELL", "echo ruok | nc localhost 2181 | grep imok"]
+      test: ["CMD-SHELL", "echo srvr | nc localhost 2181 | grep Mode"]
       interval: 10s
       timeout: 5s
       retries: 5