Move non-upstreamed NixNG modules into this repo

nixng-modules/radarr.nix

@@ -0,0 +1,31 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  cfg = config.services.radarr;
+in {
+  options.services.radarr = {
+    enable = lib.mkEnableOption "radarr";
+    package = lib.mkPackageOption pkgs "radarr" {};
+
+    dataDir = lib.mkOption {
+      type = lib.types.str;
+      default = "/var/lib/radarr/.config/Radarr";
+      description = "The directory where Radarr stores its data files.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    init.services.radarr = {
+      enabled = true;
+
+      script = pkgs.writeShellScript "radarr-run.sh" ''
+        ${lib.getExe cfg.package} -nobrowser -data='${cfg.dataDir}'
+      '';
+    };
+
+    environment.systemPackages = [cfg.package];
+  };
+}