Reduce docker image size by 35% #27
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Since docker caches each instruction as a layer, we have to clean cached packages at the end of each step for minimal image size.
> Use ADD only when you need the additional capabilities it offers, but be mindful of potential security implications. https://www.docker.com/blog/docker-best-practices-understanding-the-differences-between-add-and-copy-instructions-in-dockerfiles/
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Since docker caches each instruction as a layer, we have to clean cached packages at the end of each step for minimal image size. As a drawback, we now have to download the package index again for the compiler and final container.