python-Cerberus from Virtualization:Appliances:Builder project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Virtualization:Appliances:Builder/openSUSE_Leap_15.6/Virtualization:Appliances:Builder.repo zypper refresh zypper install python-Cerberus