nix/os/modules: add ddclient-ovh module

nix/os/modules/ddclient-ovh.nix

@@ -0,0 +1,30 @@
+{ lib
+, config
+, ... }:
+
+let
+  cfg = config.services.ddclientovh;
+
+  passwords = import ../../variables/passwords.crypt.nix;
+
+in {
+
+  options.services.ddclientovh = with lib; {
+    enable = mkEnableOption "Enable ddclient-ovh";
+    domain = mkOption {
+      type = types.string;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+      services.ddclient = {
+        enable = true;
+        protocol = "dyndns2";
+        server = "www.ovh.com";
+        ssl = true;
+        domains = [ cfg.domain ];
+        use = "web, web=ifconfig.co";
+        inherit (passwords.dyndns.${cfg.domain}) username password;
+    };
+  };
+}