目前贴图不支持 Webp，其实 WebP 压缩效率比 JPEG 高，更省磁盘空间
https://cloudinary.com/guides/front-end-development/webp-format-technology-pros-cons-and-alternatives
The key advantages of WebP over JPEG are:
- WebP provides file sizes that are 25-35% smaller than JPEG for the same level of quality, as measured by the Structural Similarity Index (SSIM).
- WebP supports animation, while JPEG does not.
