Build repo from aur packages
I recommend running this in a container or VM to prevent installing unwanted packages. To install:
git clone https://github.com/etrombly/aur_repo.git
cd aur_repo
makepkg -si
systemctl enable aur_repo --now
use visudo to uncomment the nopasswd line for wheel.
add packages you want to build in /etc/aur_repo/pkglist, one per line
then as the build user run aur_repo. Build logs are stored in /var/log/aur_repo. I'd also set a password for the build user.
on any machine that you want to sync to your aur repo add the following to /etc/pacman.conf:
[aur-local]
Server = http://[ip-of-your-container]
eventually I plan to add multi-arch support so you can use this to build raspberrypi packages.