AVIF image variants are assigned the wrong :content_type

[brian-kephart]

Same as rails/rails#43150

Steps to reproduce

Repro

Expected behavior

AVIF image variant blobs should have a :content_type of 'image/avif'

Actual behavior

AVIF image variants have a :content_type of 'video/quicktime' on the blob. At least they do when running on MacOS. The images display correctly in Chrome, but the "Content-type" header is wrong as a result of the incorrect attribute.

System configuration

Rails version: Edge
Marcel version: Edge

Ruby version: 3.0