code: def creator(entry, config):
          
          # writing Dockerfile
          dockerfile = render(config.script, model=config.model, env=config.env,
                              variables=config.variables, item=config.item)
          filename = "dockerfile.dry.run.see.comment"
  
          if not config.dry_run:
              temp = tempfile.NamedTemporaryFile(
                  prefix="dockerfile-", mode='w+t', delete=False)
              temp.writelines(dockerfile)
              temp.close()
              filename = temp.name
              dockerfile = ''
  
          # rendering the Bash script for generating the Docker image
          name = entry['name'] + "-%s" % os.getpid() if entry['unique'] else entry['name']
          tag = render(entry['tag'], model=config.model, env=config.env, item=config.item)
          template_file = os.path.join(os.path.dirname(__file__), 'templates/docker-image.sh.j2')
  
          with open(template_file) as handle:
              template = handle.read()
              config.script = render(template, name=name, tag=tag,
                                     dockerfile_content=dockerfile,
                                     dockerfile_filename=filename)
  
          return Image(config)
docs: Creator function for creating an instance of a Docker image script.