Add a night-light module

flake.nix

@@ -1,6 +1,7 @@
 {
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
   };
   outputs =
     {
@@ -19,5 +20,10 @@
           buildInputs = [ pkgs.dotnet-sdk_10 ];
         };
       }
-    );
+    )
+    // {
+      nixosModules = {
+        night-light = import ./module.nix;
+      };
+    };
 }

module.nix

@@ -0,0 +1,19 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+with lib;
+let
+  cfg = config.services.nightLight;
+in
+{
+  options.services.nightLight = {
+    enable = mkEnableOption "Night Light";
+  };
+
+  config = mkIf cfg.enable {
+    services.zigbee2mqtt.enable = true;
+  };
+}