Gem::GemcutterUtilities#add_key_option

# File tmp/rubies/ruby-4.0.0/lib/rubygems/gemcutter_utilities.rb, line 24
def add_key_option
  add_option("-k", "--key KEYNAME", Symbol,
             "Use the given API key",
             "from #{Gem.configuration.credentials_path}") do |value,options|
    options[:key] = value
  end
end