Sorry for misformatted code.

  tailscale-authkey1:
    image: tailscale/tailscale:latest
    hostname: myhost
    environment:
      - TS_AUTHKEY=xx
      - TS_STATE_DIR=/var/lib/tailscale
      - TS_USERSPACE=false
      - TS_EXTRA_ARGS=--advertise-exit-node,--accept-routes
      - TS_ROUTES=192.168.0.0/24
    volumes:
      - ts-authkey-test:/var/lib/tailscale
      - /dev/net/tun:/dev/net/tun
    cap_add:
      - NET_ADMIN
      - SYS_MODULE
    restart: unless-stopped
  nginx-authkey-test:
    image: nginx
    network_mode: service:tailscale-authkey1