[terraform] make Tunnelbroker prod release

Summary:
The container was tested while being released on staging.

Published a new image with version 0.6: link

Currently, Tunnelbroker DDB is empty, so it's safe to release a new schema.

Test Plan: Use prod workspace and terraform plan and confirm changes

Reviewers: bartek, varun, michal

Reviewed By: bartek

Subscribers: ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9743