To see whether you are in the container, and in which type container
查看当前是否在容器内，在何容器内：
root@ctr:/# ./ctrsploit env w
INFO[0000] ===========Docker=========
.dockerenv exists: ✔
rootfs contains 'docker': ✔
cgroup contains 'docker': ✘
the mount source of /etc/hosts contains 'docker': ✔
hostname match regex ^[0-9a-f]{12}$: ✔
=> is in docker: ✔
INFO[0000] ===========k8s=========
/var/run/secrets/kubernetes.io exists: ✘
hostname match k8s pattern: ✘
the mount source of /etc/hosts contains 'pods': ✘
cgroup contains 'kubepods': ✘
=> is in k8s: ✘