Feature: automatically install sccache

[dmeijboom]

It would be great if sccache would be pre-installed in the Rust docker images. The sccache binary is less than 7MB which would increase the size of the latest slim-buster image from 254MB to ~ 260MB. By default it should be disabled and enabling can be done by setting the RUSTC_WRAPPER environment variable.

I can make a PR to add the necessary changes but I would like to know if it's something that the Rust team would approve. Thanks!

[powerboat9]

I'm not very familiar with docker, but couldn't you just add sccache to your own images? It looks like the installation process is fairly short.

[dmeijboom]

I'm not very familiar with docker, but couldn't you just add sccache to your own images? It looks like the installation process is fairly short.

Yes, I could do that. In fact, that's what we already do. It just feels like it should be part of the default set of packages installed in the rust docker image.