Documentation
User Module
If you have a server, you may well want to SSH into it. The User module is there to help with that. It creates a Linux user, and allows you to specify its SSH key. It also allows you to pick a login shell, and the groups the user should belong to.
NOTE: You can only SSH into servers using the IP address of the server — the branch-based or custom domain names will not work. You can see what the IP addresses of your deployed servers are in your servers tab.