Auto-setting FASTLANE_SESSION on CI

retrieve_fastlane_session.rb

  lane :retrieve_fastlane_session do
        
        # runs shell
        # this needs SPACESHIP_SKIP_2FA_UPGRADE=1 flag
        spaceauth_output = `bundle exec fastlane spaceauth`
        # regex the output for the value we need
        fastlane_session_regex = %r{Pass the following via the FASTLANE_SESSION environment variable:\n(?<session>.+)\n\n\nExample:\n.+}
        new_session = nil
        if match = spaceauth_output.match(fastlane_session_regex)
          # strip out the fancy formatting
          new_session = match[:session].gsub("\e[4m\e[36m", "").gsub("\e[0m\e[0m", "")
        end
    
        # yell and quit if unable to parse out session from spaceauth output
        if new_session.nil?
          puts "Unable to obtain new FASTLANE_SESSION via fastlane spaceauth"
          exit 1
        else
          ENV['FASTLANE_SESSION'] = new_session
        end
    end