add cosmic vm

hosts/virtual-machines/cosmic/default.nix

@@ -0,0 +1,32 @@
+{
+  pkgs,
+  lib,
+  ...
+}:
+let
+  packages = with pkgs; [ fastfetch ];
+in
+{
+  services = {
+    desktopManager.cosmic.enable = true;
+    displayManager.cosmic-greeter.enable = true;
+  };
+
+  virtualisation.vmVariant.virtualisation = {
+    memorySize = 8192;
+    cores = 6;
+  };
+
+  environment.systemPackages = lib.lists.unique (packages);
+
+  nix = {
+    settings = {
+      substituters = [
+        "https://cosmic.cachix.org"
+      ];
+      trusted-public-keys = [
+        "cosmic.cachix.org-1:Dya9IyXD4xdBehWjrkPv6rtxpmMdRel02smYzA85dPE="
+      ];
+    };
+  };
+}

hosts/virtual-machines/cosmic/flake.nix

@@ -0,0 +1,37 @@
+{
+  description = "System Configuration @ cswimr 2024";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    cosmic.url = "github:lilyinstarlight/nixos-cosmic";
+  };
+  outputs =
+    {
+      self,
+      nixpkgs,
+      cosmic,
+      ...
+    }@inputs:
+    let
+      user = "nixos";
+      system = "x86_64-linux";
+    in
+    {
+      nixosConfigurations = {
+        nixos = nixpkgs.lib.nixosSystem {
+          system = system;
+          specialArgs = {
+            inherit inputs;
+            system = system;
+            hostname = "nixos";
+            user = user;
+          };
+          modules = [
+            # imports
+            ../common.nix
+            ./default.nix
+            cosmic.nixosModules.default
+          ];
+        };
+      };
+    };
+}