[0.001s][warning][os,thread] Failed to start thread "GC Thread#0" - pthread_create failed (EPERM) for attributes: stacksize: 1024k, guardsize: 4k, detached.
위와 같은 에러 출력시
docker run statement에 --security-opt seccomp=unconfined 파라미터 포함하여 해결
출처 : https://github.com/keycloak/keycloak/issues/17404