If you're not familiar with Docker or containers in general, this may seem like magic. To simplify things, you can think of these images as "virtual" operating systems that have been pre-configured with specific versions of certain tools. For [fast turnaround, binary caching, and building compiler forks](https://www.gentoo.org/) the CI images are built on top of [Gentoo Linux](https://www.gentoo.org/). The devcontainer images are built on top of Ubuntu so that Microsoft's devcontainer images can be used as a base.
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