Run ZeroTier on RancherOS

rancher-zerotier.yml

# zerotier configuration
zerotier:
  image: zerotier/zerotier-containerized:1.2.4
  labels:
    io.rancher.os.scope: system
  volumes:
    - /var/lib/zerotier-one:/var/lib/zerotier-one
  restart: always
  net: host
  devices:
    - /dev/net/tun:/dev/net/tun
  cap_add:
    - NET_ADMIN
    - SYS_ADMIN
  volumes_from:
    - system-volumes
zerotier-join:
  image: zerotier/zerotier-containerized:1.2.4
  labels:
    io.rancher.os.scope: system
  volumes:
    - /var/lib/zerotier-one:/var/lib/zerotier-one
  restart: on-failure
  net: host
  entrypoint: /zerotier-cli join XYZ
  depends_on:
    - zerotier