Gem::ConfigFile#set_config_file_name

# File tmp/rubies/ruby-3.0.5/lib/rubygems/config_file.rb, line 493
def set_config_file_name(args)
  @config_file_name = ENV["GEMRC"]
  need_config_file_name = false

  args.each do |arg|
    if need_config_file_name
      @config_file_name = arg
      need_config_file_name = false
    elsif arg =~ /^--config-file=(.*)/
      @config_file_name = $1
    elsif arg =~ /^--config-file$/
      need_config_file_name = true
    end
  end
end