Add docker compose file for docker worker netboot
tftp, ser2net and nfs services are required for docker worker to support network booting. This docker compose file lunch these services using the below volumes that used by docker worker so that they can work together.
To avoid adding per device port mapping in docker compose file for adding new devices, host network mode will be used for ser2net service.
Signed-off-by: Chase Qi firstname.lastname@example.org