start sshd by default to allow installation on headless systems
Currently it is not possible to install to a headless system without having access to it and attaching at least a keyboard. See Install Arch Linux via SSH - ArchWiki.
A headless installation requires:
-
rootuser with a default password. -
PermitRootLogin yesin/etc/ssh/sshd_config. - enabled
sshd.service.