For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:crameleon:keyserver/openSUSE_Tumbleweed/home:crameleon:keyserver.repo
zypper refresh
zypper install keyserver
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:crameleon:keyserver/openSUSE_Factory_ARM/home:crameleon:keyserver.repo
zypper refresh
zypper install keyserver
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:crameleon:keyserver/15.4/home:crameleon:keyserver.repo
zypper refresh
zypper install keyserver