The binary we have on Github release page right now is built by us, however it is not easily discoverable by the GNOME Software. We have applied to Flathub for that, which compiles and distributes the binaries by itself.
If one wants to use the binary built by us, then it needs to be downloaded by hand and installed using CLI at the moment. If there would be a demand, perhaps we could offer own Flatpak repo (idea to discuss).
cc @daringer
Originally posted by @szszszsz in https://github.com/Nitrokey/nitrokey-app/issues/114#issuecomment-767435848