Add support of Windows about busybox HOT 7 CLOSED

cc @PatrickLang @adelina-t

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As I noted in kubernetes/kubernetes#61097, this requires upstream support for Windows which does not currently exist. There are a couple discussions on their mailing list (I found a few interesting ones by searching for site:busybox.net combined with "Windows", "win32", and "mingw"), and I also went as far as trying to compile against MinGW without much success.

Barring actual upstream support for this, I'm sorry but there's not much we can do. From what I can see, upstream needs some patching and also a champion to maintain support going forward.

If someone can demonstrate building unpatched sources from busybox.net for Windows, I would be thrilled to revisit this.

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@tianon when you say upstream which repository do you mean? is there a issue tracker there?

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this requires upstream support for Windows which does not currently exist

@tianon I thought upstream means docker-library/busybox. Do you mean the code base of busybox itself?

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I don't know the full history here, but there is a fork of busybox that's tailored to mingw at https://github.com/rmyorston/busybox-w32 . If that project accepts a Dockerfile and were to publish an image - would it be acceptable to use that version?

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Not for the busybox "official image" -- it isn't exactly fair to the BusyBox project if we use an unofficial port and call it more than that, so I wouldn't be entirely comfortable with that route (and we've had poor experiences with doing/allowing that in the past; see the redis Windows variants for an example of that where the fork was never really on par with upstream and eventually died entirely).

On the flip side, it should be pretty trivial for someone else to take that, build it, publish an image, and combine that image together with the image we publish (in some automated fashion, probably) under a single manifest list.

I would really hope the ultimate goal of that project would be to get merged back into the BusyBox tree proper. 😅

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