fix(docker): set console log to debug when testing

.ci/docker-compose-file/conf.cluster.env

@@ -4,4 +4,5 @@ EMQX_CLUSTER__STATIC__SEEDS="[emqx@node1.emqx.io, emqx@node2.emqx.io]"
 EMQX_ZONES__DEFAULT__LISTENERS__MQTT_TCP__PROXY_PROTOCOL=true
 EMQX_ZONES__DEFAULT__LISTENERS__MQTT_WS__PROXY_PROTOCOL=true
 EMQX_LOG__CONSOLE_HANDLER__ENABLE=true
+EMQX_LOG__CONSOLE_HANDLER__LEVEL=debug
 EMQX_LOG__PRIMARY_LEVEL=debug