For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:firstyear:kanidm/openSUSE_Tumbleweed/home:firstyear:kanidm.repo
zypper refresh
zypper install kanidm-unixd-clients
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:firstyear:kanidm/15.6/home:firstyear:kanidm.repo
zypper refresh
zypper install kanidm-unixd-clients
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:firstyear:kanidm/15.5/home:firstyear:kanidm.repo
zypper refresh
zypper install kanidm-unixd-clients