It appears that signal forked ringrtc within this release, so until they
merge their changes upstream, or the stable release follows suit, we
have another delta we need to inject and track.
signal-desktop-beta was removed due to maintainability concerns in
256e347dfe. Unfortunately, there are a
number of features, like stories, that are only enabled on the beta
builds. As such, this change adds that package back, but based upon the
current signal-desktop derivation.
We have restructured the derivation into the generic+versions structure
seen in libmicrohttpd, however since there are a fixed number of
releases, stable and beta, they both live default.nix and are inherited
at the top level.
I have also added myself to the maintainers list, however we could also
split that up, so that I alone bear the maintenance responsibilities.
