Quarkus - Start web server on demand

Question

There is a CLI application written in Quarkus, it works as follows:

$ quarkus-app --input Hello
Output: olleH

Now there should also be the possibility to call this via a REST. However, this server should only be stared if the argument "--server" is passed:

$ quarkus-app --server &
Listening on '127.0.0.1:7070'
$ curl http://127.0.0.1:7070/api/reverse?input=Hello
Output: olleH

Now how do I get the WebServer to start only on "--server"?

My code currently looks like this:

@QuarkusMain
class CommandLine : QuarkusApplication {

    override fun run(vararg args: String?): Int {
        val options: Options = Options()
        options.addOption("i", "input", false, "Input to reverse")
        options.addOption("s", "server", false, "Start server")

        val parser: CommandLineParser = DefaultParser()
        val cmd: CommandLine = parser.parse(options, args)
        if (cmd.hasOption("server")) {
          // TODO: Start server
        } else if (cmd.hasOption("input")) {
          println("Output: ${cmd.getOptionValue("input").toString().reversed()}")
        }
        return 0
    }
}