uptime-kuma: add defaults for simpler initial setup

Changed files
+2
nixos
modules
services
monitoring
+2
nixos/modules/services/monitoring/uptime-kuma.nix
···
services.uptime-kuma.settings = {
DATA_DIR = "/var/lib/uptime-kuma/";
NODE_ENV = mkDefault "production";
+
HOST = mkDefault "127.0.0.1";
+
PORT = mkDefault "3001";
};
systemd.services.uptime-kuma = {