Small update. I have an official devel project now, so please do not put the above outdated info on the website :)
The new official repos are:
openSUSE Leap 15.2 (stable version):
sudo zypper ar -f https://download.opensuse.org/repositories/Application:/astrophotography/openSUSE_Leap_15.2/ Astrophotography_Software
openSUSE Leap 15.3 (beta version):
sudo zypper ar -f https://download.opensuse.org/repositories/Application:/Astrophotography/openSUSE_Leap_15.3/ Astrophotography_Software
openSUSE Tumbleweed (rolling release):
sudo zypper ar -f https://download.opensuse.org/repositories/Application:/Astrophotography/openSUSE_Tumbleweed/ Astrophotography_Software