Add Foreman to iHat

It also contains the same commands we have in Tahi, so `bin/foreman-start`, `bin/foreman-stop`, and `bin/foreman-list` are also available.
Do you need `export` in this file? [Tahi's `.env-sample`](https://github.com/Tahi-project/tahi/blob/master/.env-sample) doesn't have any.