[Tunnelbroker] Add docker image

Summary:
Package tunnelbroker into a docker image

https://linear.app/comm/issue/ENG-4103

Test Plan:

./services/tunnelbroker/make_docker_image.sh

or

# build all service images
cd services/ && docker-compose build

Reviewers: varun, bartek, ashoat

Reviewed By: varun

Subscribers: michal, tomek

Differential Revision: https://phab.comm.dev/D8230