subdomain = lib.mkOption {

        fqdn = lib.mkOption {

          example = "cache1";
          description = "Subdomain where the cache will be served";

          example = "cache1.plumj.am";
          description = "Fully qualified domain where the cache will be served";

        services.nginx.virtualHosts."${config.cache.subdomain}.${domain}" =
          merge config.services.nginx.sslTemplate
            {
              locations."/".proxyPass = "http://127.0.0.1:${toString port}";
            };

        services.nginx.virtualHosts.${config.cache.fqdn} = merge config.services.nginx.sslTemplate {
          locations."/".proxyPass = "http://127.0.0.1:${toString port}";
        };

            subdomain = "cache1";

            fqdn = "cache1.plumj.am";