You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: service.rb
    path of file: ./repos/gitlabhq/lib/gitlab/ci/config/entry
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module Ci
    class Config
      module Entry
        ##
        # Entry that represents a configuration of Docker service.
        #
        class Service < ::Gitlab::Conf
    
          def value
            if hash?
              super.merge(
                command: @config[:command],
                alias: @config[:alias],
                variables: (variables_value if variables_defined?)
              ).compact
            else
              super
            end