Add gif support to supabase image transformations - or specify in docs that it is not supported.

Currently if you try and transform a .gif file it will make the gif static (by using only the first frame). Which is the default behaviour of imgproxy.




imgproxy does support transforming more than 1 frame in a gif file but requires changing an environment variable:

[IMGPROXY_MAX_ANIMATION_FRAMES](

Perhaps passing format: 'gif' in the transform options could allow for it?

If not it should be at least updated in the docs that gif files are not supported in image transformations. Since it shows misleading information:


![image](

![image](