adding kohlin to the flake

README.org

@@ -132,6 +132,12 @@ Both include the home-manager module. Primarily I chose that route so that I cou
             nix-bitcoin.nixosModules.default
           ];
         };
+        kohlin = nixpkgs-stable.lib.nixosSystem {
+          inherit system;
+          modules = [
+            ./system/kohlin/configuration.nix
+          ];
+        };
       };
     };
 }