Tarball releases aren’t essential for gentoo ebuilds, they can also be set to clone a git repository or up to a certain commit of a git repository. Plus, when I cloned https://git.jami.net/savoirfairelinux/jami-project , the python script can automatically pull in the master branch, or the latest stable release.
And as for the ring-overlay, it hasn’t been updated since May iirc and nothing builds, including the live ebuilds. But, I want to get the python script to recognize and support gentoo, and it would eliminate 99% of the overhead of maintaining any ebuilds, as you could just call the python script and let it do all of the work. I certainly do not blame the maintainer of the ring-overlay for not updating, writing an ebuild currently seems painful.
And I’m alright with that, I like Qt better regardless