Source system and user qvm.conf; add memory/cpus options; fix flake path

flake.nix

@@ -15,12 +15,36 @@
     {
       nixosModules.default =
         {
+          config,
+          lib,
           pkgs,
           ...
         }:
+        let
+          cfg = config.programs.qvm;
+        in
         {
+          options.programs.qvm = {
+            memory = lib.mkOption {
+              type = lib.types.str;
+              default = "8G";
+              description = "Amount of memory to allocate to the VM (e.g., '8G', '16G')";
+            };
+
+            cpus = lib.mkOption {
+              type = lib.types.int;
+              default = 4;
+              description = "Number of CPU cores to allocate to the VM";
+            };
+          };
+
           config = {
             environment.systemPackages = [ self.packages.${pkgs.system}.qvm ];
+
+            environment.etc."xdg/qvm/qvm.conf".text = ''
+              QVM_MEMORY="${cfg.memory}"
+              QVM_CPUS="${toString cfg.cpus}"
+            '';
           };
         };
     }