Rails InstantApp and settings about new app


#Ruby on rails
Hello everyone,
I would know if someones had try to create new rails app on Scaleway servers and what are the settings that you have done because even with the getting started I didn’t reach to create a new one (unicorn server settings and all…)
##Ruby and Rails versions
Is it possible to change the version of ruby and rails into the scaleway servers ?

Thanks for your help !