Update "Setting up the development environment" documentation to recommend using a Ruby Version Manager after the introduction of Gemfile and .ruby-version

[Adnan-Bacic]

Recently this proposal was accepted: #411

and version 0.67 of react-native comes with a Gemfile and a .ruby-version.

Inside the Gemfile there is a comment saying:
# You may use http://rbenv.org/ or https://rvm.io/ to install and use this version

However the documentation for environment-setup says this:
You can use a Ruby Version manager, however we recommend that you use the standard Ruby available on macOS unless you know what you're doing.

I feel like these contradict each other. The documentation recommends not using a Ruby Version Manager while the project files do.

So i would propose to update the documentation to recommend using a Ruby Version Manager, similarly to the Gemfile.

[cortinico]

I feel like these contradict each other.

I don't think they actually contradict each other. The template is "ready to work" with a Ruby Version manager. However, we recommend you use the standard Ruby on macOS, mostly because we want to reduce the number of steps needed to setup a new RN project.

[Adnan-Bacic]

i see the reason for that. though i did just notice that the documentation for windows + android has this line:

It is recommended to use an LTS version of Node. If you want to be able to switch between different versions, you might want to install Node via nvm-windows, a Node version manager for Windows.

macOS just recommends using brew and not nvm.

maybe instead of explicitly recommending using a Ruby Version Manager, it could similarly just suggest using it. so people are aware it exists.

[cortinico]

Yes, all the platforms should all be aligned to suggest a version manager, that's reasonable (both for node and ruby).