Para openSUSE Leap 15.2 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/Cloud:OpenStack:Victoria/openSUSE_Leap_15.2/Cloud:OpenStack:Victoria.repo
zypper refresh
zypper install openstack-dashboard
Para 15.4 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/Cloud:OpenStack:Victoria/15.4/Cloud:OpenStack:Victoria.repo
zypper refresh
zypper install openstack-dashboard
Para 15.3 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/Cloud:OpenStack:Victoria/15.3/Cloud:OpenStack:Victoria.repo
zypper refresh
zypper install openstack-dashboard