Add a new dev/TU

Add the user to group_vars/all/archusers.yml
Copy the ssh key to pubkeys/$username.pub
Run ansible-playbook -t archusers playbooks/*.yml or similar
To create a new user in archweb use: https://www.archlinux.org/devel/newuser/ This is also linked in the django admin backend at the top
For email accounts refer to docs/email.txt