https://discussion.fedoraproject.org/t/rpmsoftwaremanagement-ci-libdnf5-pr1215/29506
rpmsoftwaremanagement/CI-libdnf5-pr1215 - Fedora Discussion
May 4, 2021 - Description Description not filled in by author. Very likely personal repository for testing purpose, which you should not use. Installation Instructions...
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https://packages.debian.org/unstable/libdnf5-2
Debian -- Details of package libdnf5-2 in sid
Dandified Yum package manager - version 5 library
debiandetailspackagesid