finally my custom iso

flake.nix

@@ -127,6 +127,12 @@
           raspberry-pi-nix.nixosModules.sd-image
         ];
       };
+      myISO = nixpkgs.lib.nixosSystem {
+        modules = [
+          "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-graphical-calamares-plasma6.nix"
+          ./hosts/iso/configuration.nix
+        ];
+      };
     };
     homeConfigurations = {
       # doesnt work because my different systems have different stateVersions

hosts/iso/configuration.nix

@@ -0,0 +1,31 @@
+{
+  config,
+  lib,
+  pkgs,
+  system,
+  ...
+}: {
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
+
+  nixpkgs.config.allowUnfree = true;
+  # Set environment variable for allowing non-free packages
+  environment.sessionVariables = {
+    NIXPKGS_ALLOW_UNFREE = "1";
+  };
+
+  environment.systemPackages = with pkgs; [
+    # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
+    git
+    curl
+    parted
+    nano
+    comma
+    just
+    age
+  ];
+}