My custom flake for some program not packaged in Nix/overrides

You can run any program via:

nix run github:shwewo/<program>

If you want to use telegram desktop with patches, please visit this page

https://github.com/shwewo/telegram-desktop-patched

To add this to system-wide configuration do this:

flake.nix

inputs = {
  shwewo.url = "github:shwewo/flake";
  # your other inputs
};

outputs = inputs @ { self, nixpkgs, ... }: {
  nixosConfigurations.<HOSTNAME> = stable.lib.nixosSystem {
    system = "x86_64-linux"; 
    specialArgs = { inherit inputs }; # this line is important
    modules = [ ./configuration.nix ];
  };
}; 

And then you can just add this:

configuration.nix

environment.systemPackages = with pkgs; [
  inputs.shwewo.packages.${pkgs.system}.<program>
  # your other programs
]