def copy_file(source, destination)
      log.debug(log_key) { "Copying `#{source}' to `#{destination}'" }
      FileUtils.cp(source, destination)
      destination
    end
def copy_file(source, destination)
      log.debug(log_key) { "Copying `#{source}' to `#{destination}'" }
      FileUtils.cp(source, destination)
      destination
    end
Copy the +source+ file to the +destination+.

 @param [String] source
 @param [String] destination

 @return [String]
   the destination path