For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ojkastl_buildservice:Branch_network_utilities/openSUSE_Factory/home:ojkastl_buildservice:Branch_network_utilities.repo
zypper refresh
zypper install lego
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ojkastl_buildservice:Branch_network_utilities/15.6/home:ojkastl_buildservice:Branch_network_utilities.repo
zypper refresh
zypper install lego