make a module for dnsmasq

modules/dnsmasq/default.nix

@@ -0,0 +1,22 @@
+{ lib, pkgs, config, ...}:
+let
+  inherit (lib) mkOption types;
+in {
+  options = {
+    system.service.dnsmasq = mkOption {
+      type = types.functionTo types.package;
+    };
+  };
+  config = {
+    system.service.dnsmasq = pkgs.callPackage ./service.nix {};
+    users.dnsmasq = {
+      uid = 51; gid= 51; gecos = "DNS/DHCP service user";
+      dir = "/run/dnsmasq";
+      shell = "/bin/false";
+    };
+    groups.dnsmasq = {
+      gid = 51; usernames = ["dnsmasq"];
+    };
+    groups.system.usernames = ["dnsmasq"];
+  };
+}