# cat > /etc/portage/repos.conf/lumi.conf << EOF
[lumi]
location = /usr/local/share/lumi-overlay/
sync-type = git
sync-uri = https://gogs.lumi.pw/mike/portage.git
auto-sync = Yes
EOF
# eix-sync
Another way is:
# eselect repository add lumi git https://gogs.lumi.pw/mike/portage.git