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If you build a lot of containers, and have a not-so-fast internet link, you might be spending a lot of time waiting for packages to download. It would be nice if all those downloads could be automatically cached, without tweaking your Dockerfiles, right? Or, maybe your corporate network forbids direct outside access, and require you to use a proxy. Then you can edit this recipe so that it cascades to the corporate proxy. Your containers will use the transparent proxy, which itself will pass alon...