Reorganize flake.nix to not require changing variables to install a fresh system

flake.nix

@@ -46,13 +46,14 @@
     }@inputs:
     let
       system = "x86_64-linux";
-      host = "vm";
-      profile = "desktop";
-      username = "josh";
     in
     {
       nixosConfigurations = {
-        nixos = nixpkgs.lib.nixosSystem {
+        vm = let
+          host = "vm";
+          profile = "desktop";
+          username = "josh";
+        in nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
             inherit inputs;
@@ -65,12 +66,16 @@
           ];
         };
 
-        live = nixpkgs.lib.nixosSystem {
+        live = let
+          host = "installation-iso";
+          profile = "desktop";
+          username = "josh";
+        in nixpkgs.lib.nixosSystem {
           inherit system;
           specialArgs = {
             inherit inputs;
-            host = "installation-iso";
-            profile = "desktop";
+            inherit host;
+            inherit profile;
             inherit username;
           };
           modules = [
@@ -81,7 +86,10 @@
         };
       };
 
-      homeConfigurations.${username} = home-manager.lib.homeManagerConfiguration {
+      homeConfigurations.josh = let
+        profile = "desktop";
+        username = "josh";
+      in home-manager.lib.homeManagerConfiguration {
           extraSpecialArgs = {
             inherit inputs;
             inherit profile;
@@ -89,7 +97,7 @@
           };
         pkgs = nixpkgs.legacyPackages.${system};
         modules = [
-          ./homes/${username}/home.nix
+          ./homes/josh/home.nix
           stylix.homeModules.stylix
         ];
       };

rebuild.sh

@@ -4,7 +4,7 @@ echo "Removing old qcow2 disk ..."
 rm -f ./vm.qcow2
 
 echo "Building new VM ..."
-nix build .#nixosConfigurations.nixos.config.system.build.vm
+nix build .#nixosConfigurations.vm.config.system.build.vm
 
 if [ $? -ne 0 ]; then
     echo "Failed to build VM"