remove_packages (like install_packages but to remove)

[cortopy]

It's usual to have some build steps in the Dockerfile which require packages no longer needed once the container is up and running.

It would be great to have remove_packages that, like install_packages, does all the cleaning associated with uninstalling a package

[beltran-rubo]

Thanks for the suggestion. We will add it to our to-do list but any PR will be welcome to speed up the implementation.