obs-service-git_tarballs from home:louis94_m:freeciv21 project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:louis94_m:freeciv21/openSUSE_Tumbleweed/home:louis94_m:freeciv21.repo
zypper refresh
zypper install obs-service-git_tarballs