code: def get_dusty_images():
      
      specs = get_specs()
      dusty_image_names = [spec['image'] for spec in specs['apps'].values() + specs['services'].values() if 'image' in spec]
      dusty_images = set([name  if ':' in name else "{}:latest".format(name) for name in dusty_image_names])
      return dusty_images
docs: Returns all images listed in dusty specs (apps + bundles), in the form repository:tag.  Tag will be set to latest
      if no tag is specified in the specs