Xcode 11.4 - Updated Image

@seki-ne1 Hey

So as you went from 11.1 to 11.4, the base macOS version changed from Mojave to Catalina (we made this change in 11.2 and up).

There is a change in the way Ruby needs to be set in Catalina and above and it looks like your config is specifying the old method so Ruby is defaulting to the system Ruby - the system Ruby is pretty notorious for having permission issues when installing / working with gems.

Try using the following:

run:
  name: Set Ruby Version
  command: echo 'chruby ruby-2.6' >> ~/.bash_profile

Hope this helps