We have offered a arch mail address, for support staff, for over a
year[1][2] and the only difference, is that support staff must only be
granted SSH access to mail.archlinux.org. SSH access to
homedir.archlinux.org is also allowed, but it is opt-in[3].

[1] 7287d6d3 ("archroles: Add support-staff group")
[2] 50c3e0f9 ("archusers: Support restricting users to specific hosts")
[3] e0e52552 ("Allow Alad access to homedir.archlinux.org")

Fix #372