feat: package u2c, the fast copyparty uploader

modules/desktop/apps/u2c.nix

@@ -0,0 +1,9 @@
+{ self, ... }:
+
+{
+  flake.modules.nixos.desktop = { pkgs, ... }: let
+    system = pkgs.stdenv.hostPlatform.system;
+  in {
+    environment.systemPackages = [ self.packages.${system}.u2c ];
+  };
+}

modules/packages/u2c.nix

@@ -0,0 +1,29 @@
+{ ... }:
+
+{
+  perSystem = { pkgs, ... }: {
+    packages.u2c = pkgs.stdenv.mkDerivation {
+      name = "u2c";
+      version = "2.19";
+
+      src = pkgs.fetchurl {
+        url = "https://raw.githubusercontent.com/9001/copyparty/6694998985e98326ca4ca0a0724cfd4901be2430/bin/u2c.py";
+        hash = "sha256-IyYBB6yIIQB1FAFLs6xOw5+A09W+JKRj4FF/CwiFru0=";
+      };
+      dontUnpack = true;
+
+      installPhase = ''
+        mkdir -p $out/bin
+        cp $src $out/bin/u2c
+        chmod +x $out/bin/u2c
+      '';
+
+      buildInputs = [ pkgs.python3 ];
+
+      meta = {
+        description = "A fast uploader for Copyparty";
+        homepage = "https://github.com/9001/copyparty";
+      };
+    };
+  };
+}