docs: def build_image(image_path, image_name, build_args=None, dockerfile_path=None):
      """Build an image
  
      Args:
      image_path (str): the path to the image directory
      image_name (str): image 'name:tag' to build
      build_args (dict, optional): dict of docker build arguments
      dockerfile_path (str, optional):
          path to dockerfile relative to image_path
          if not `image_path/Dockerfile`.
      """
      cmd = ['docker', 'build', '-t', image_name, image_path]
      if dockerfile_path:
          cmd.extend(['-f', dockerfile_path])
  
      for k, v in (build_args or {}).items():
          cmd += ['--build-arg', '{}={}'.format(k, v)]
      check_call(cmd)