With that said, they have recently changed the architecture, with the local install required, and I have not managed (yet) to get it working with NixOS. Once I have some more time, I will try again - it looks like there will be some hoops to go through. https://nixos.org/manual/nixpkgs/stable/#ssec-pkgs-appimageT...
Kudos to the Source Graph team, Source Graph's original product was nicely thought out and ahead of it's time. Nice to see how the original product gave a nice basis for building out Cody.