For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:15:testing:samba-addc/openSUSE_Tumbleweed/spins:invis:15:testing:samba-addc.repo
zypper refresh
zypper install samba
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:15:testing:samba-addc/15.5/spins:invis:15:testing:samba-addc.repo
zypper refresh
zypper install samba
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:15:testing:samba-addc/15.4/spins:invis:15:testing:samba-addc.repo
zypper refresh
zypper install samba