Cider V1 had a Flatpak package and it makes it very easy to run Cider anywhere that supports flatpak. 

You would probably have to host your own Flatpak repository and offer a .Flatpakref so people who can download the .Flatpakref can add the repo and install Cider.

I use an atomic distro (Fedora Silverblue) and while I can use the rpm package, it would be so much nicer to use a Flatpak.

Echo on this request.

The flatpak image of cider is out of date. I'm unsure why you would develop an AppImage. No one wants to install the requirements to run AppImages on their systems.  Obviously https://build.opensuse.org/is fantastic for building RPM's for RedHat/Fedora/OpenSUSE as well as DEB packages for Debian based systems.

Using OBS + Flatpak, you are appealing to the widest Linux community with the minimal required effort. The current RPM is limited to Fedora based systems and fails on OpenSUSE for example.

I use Bluefin, agreed that flatpack would make it much easier for me to use this app.