For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Marvin1973:branches:home:bjoernv/openSUSE_Leap_15.1/home:Marvin1973:branches:home:bjoernv.repo
zypper refresh
zypper install mysql-community-server
For openSUSE Leap 15.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Marvin1973:branches:home:bjoernv/openSUSE_Leap_15.0/home:Marvin1973:branches:home:bjoernv.repo
zypper refresh
zypper install mysql-community-server