To be able to use the packages built by the server you can add it directly to your pacman.conf
.
To add the custom repository to your pacman configuration you can simply append the following section to your /etc/pacman.conf
file.
[aurbuild]
Server = http://your-server-domain-or-ip/repo
Make sure to replace aurbuild
with the name you put in the server configuration under repo_name
in the server config.
If you do not enable signing you will need to add the following line to disable signature checking.
SigLevel = Optional TrustAll