code: public static ConfigurableApplicationContext start(Class<?>[] app, String... args) {
          Class<?>[] apps = ObjectArrays.concat(app, GHEventApiServer.class);
          return SpringApplication.run(apps, args);
      }
docs: The method to start multiple {@code app}s under the server.
  
  @param app multiple apps that will be included
  @param args the optional (command-line) arguments
  @return the running {@link ApplicationContext}