Stop trying to find an mdbook specific docker image.
Instead, do a nice Rust image, and install mdbook from source. This is bandwidth- and cpu-inefficient, sadly, but it does get us an up-to-date version of mdbook.
Instead, do a nice Rust image, and install mdbook from source. This is bandwidth- and cpu-inefficient, sadly, but it does get us an up-to-date version of mdbook.