I suggest that the version number in setup.cfg for zenith-client should match the tagged version number of the Zenith release it is packaged for:
Currently the version of the released Zenith client container is at odds with the version of the zenith-client Python package:
$ podman image inspect azimuth-cloud/zenith-client:0.15.0 | jq '.[].Labels."org.opencontainers.image.version"'
"0.15.0"
$ podman exec zenith-client /venv/bin/python -m pip list | grep -E '^zenith'
zenith-client 0.1.0