まさかBuildKit相当？までSwiftで実装し直そうとしてるとは思わなかった。 https://github.com/apple/container/blob/main/Sources/NativeBuilder/README.md

container/Sources/NativeBuilder/README.md at main · apple/container

A tool for creating and running Linux containers using lightweight virtual machines on a Mac. It is written in Swift, and optimized for Apple silicon. - apple/container