service/dyndns: migrate from serverle

modules/services/dyndns/default.nix

@@ -0,0 +1,34 @@
+# running dyndns updates
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.services.dyndns;
+  domain = config.networking.domain;
+in
+{
+  options.my.services.dyndns = with lib; {
+    enable = mkEnableOption "Dyndns";
+
+    username = mkOption {
+      type = types.str;
+      description = "Username for the dyndns.";
+      example = "admin";
+      default = "Stunkymonkey-dyndns";
+    };
+    passwordFile = mkOption {
+      type = types.path;
+      description = "Password for the username for dyndns.";
+      example = "/run/secrets/freshrss";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.ddclient = {
+      enable = true;
+      server = "dyndns.inwx.com";
+      username = cfg.username;
+      passwordFile = cfg.passwordFile;
+      domains = [ "serverle.${domain}" ];
+      ipv6 = true;
+    };
+  };
+}