$ doas eselect repository enable bratishkaerik-overlay

$ doas >> /etc/portage/repos.conf/bratishkaerik-overlay.conf << _EOF_

[bratishkaerik-overlay]
location = /var/db/repos/bratishkaerik-overlay
sync-type = git
sync-uri = https://git.sr.ht/~bratishkaerik/bratishkaerik-overlay

_EOF_

$ doas emaint sync -r bratishkaerik-overlay