openrgb: add startupProfile option to service (#408517)

nixos/modules/services/hardware/openrgb.nix

@@ -41,6 +41,11 @@ in
       description = "Set server port of openrgb.";
     };
 
+    startupProfile = lib.mkOption {
+      type = lib.types.nullOr (lib.types.str);
+      default = null;
+      description = "The profile file to load from \"/var/lib/OpenRGB\" at startup.";
+    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -61,7 +66,9 @@ in
       serviceConfig = {
         StateDirectory = "OpenRGB";
         WorkingDirectory = "/var/lib/OpenRGB";
-        ExecStart = "${cfg.package}/bin/openrgb --server --server-port ${toString cfg.server.port}";
+        ExecStart =
+          "${cfg.package}/bin/openrgb --server --server-port ${toString cfg.server.port}"
+          + lib.optionalString (builtins.isString cfg.startupProfile) " --profile ${lib.escapeShellArg cfg.startupProfile}";
         Restart = "always";
       };
     };