flist	entrypoint	env vars
Alpine	/entrypoint.sh	SSH_KEY
Ubuntu	/init.sh	SSH_KEY
CentOS	/entrypoint.sh	SSH_KEY
K3s	/sbin/zinit init	- SSH_KEY - K3S_TOKEN - K3S_DATA_DIR - K3S_FLANNEL_IFACE - K3S_NODE_NAME - K3S_URL https://${masterIp}:6443