Trying to learn how to write a Nix config to run the moonlight server, to replace the docker config.

• Ran nix run nixpkgs#forgejo-lts, but I can't install the application because the application data path is set to the nix store folder, which is not writable. Nothing I change in the wizard fixes this problem. I'm not sure how to fix this.
• Trying to run nix-shell -p forgejo-lts instead, but when I try running forgejo it says that it can't find the command.
• I find out by running echo $PATH that the binary in the Nix store directory for Forgejo is actually still gitea -- apparently Nix is downloading Forgejo 7.0.9, which is very old.
• Nix has "channels" which essentially work like a package manager from which you ultimately end up downloading packages from. https://nixos.wiki/wiki/Nix_channels
• Apparently I'm configured to use the unstable channel
• I needed to run nix-channel --update to update the channel
• When I ran nix-shell -p forgejo-lts, it ran the newest version 15.0.11