def tag(*tags)
      attribute "tags" do |existing_tags|
        existing_tags ||= []
        tags.each do |tag|
          if !existing_tags.include?(tag.to_s)
            existing_tags << tag.to_s
          end
        end
        existing_tags
      end
    end
def tag(*tags)
      attribute "tags" do |existing_tags|
        existing_tags ||= []
        tags.each do |tag|
          if !existing_tags.include?(tag.to_s)
            existing_tags << tag.to_s
          end
        end
        existing_tags
      end
    end
Patchy tags
 tag 'webserver', 'apache', 'myenvironment'