I’m usually not adding the AppImage immediately because I’ll have to wait for OBS to actually build it. That might be delayed further if there are build issue. Therefore I’ve also skipped the last release entirely. I’ve just been uploading the binary for the latest release.
There’s one important remark regarding the AppImage: It contains very outdated libraries and I might stop updating it at any point when it becomes unfeasible to maintain because the required build environment is too old. The AppImage is merely intended for being able to try the software out anyways. If you decide to actually use it I would recommend to take the effort to create a package/binary as appropriate for your platform.
I might replace the AppImage in the future with a self-contained binary where Qt and a few other problematic dependencies are linked-in statically. This might require a newer version of libc and the Linux kernel than the AppImage currently does but would allow to use newer versions of certain dependencies. Still, this kind of distribution is mainly focusing on the “try out” factor and not intended for permanent use.
About Debian packaging: Nothing has changed since the last updates to Create and maintain Flatpak and Debian packages · Issue #33 · Martchus/syncthingtray · GitHub. So anybody is welcome to create packages but I personally don’t care about Debian simply because I can not care about any distribution out there.