Flake: add copyparty flake

flake.nix

@@ -36,6 +36,9 @@
 
     nix-impermanence.url = "github:nix-community/impermanence";
 
+    copyparty.url = "github:toast003/copyparty/nix-overhaul";
+    copyparty.inputs.nixpkgs.follows = "nixpkgs-raw";
+
     /*
     These are the same input, just following different nixpkgs versions
     This avoids some wierdness when using one that follows unstable on a stable nixpkgs
@@ -218,6 +221,7 @@
             Everest = {
               stable = true;
               modules = [
+                copyparty.nixosModules.default
                 ./roles/server
               ];
             };