Add NixOS kiosk flake and config

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "Kiosk NixOS ISO with Firefox in kiosk mode";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    flake-utils.url = "github:numtide/flake-utils";
+    nixos-generators.url = "github:nix-community/nixos-generators";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, nixos-generators }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs { inherit system; };
+    in {
+      # Build a bootable ISO image using nixos-generators
+      packages.iso = nixos-generators.nixosGenerate {
+        inherit pkgs;
+        format = "iso";
+        modules = [ ./nixos/kiosk.nix ];
+      };
+
+      # Expose the NixOS configuration for direct use if desired
+      nixosConfigurations.kiosk = let
+        lib = nixpkgs.lib;
+      in lib.nixosSystem {
+        system = "x86_64-linux";
+        modules = [ ./nixos/kiosk.nix ];
+      };
+    });
+}