463 support os root

[sean9999]

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add support for os.Root. see: https://go.dev/blog/osroot.

This code mainly sticks to just the task at hand, however in order to make CI tests pass, I had to do some very minor clean-ups.

I introduce the interface Root, which satisfies the same method-set as os.Root.

Root is basically a "chroot". It offers a root-relative view into a filesystem that you can't escape.

Root is powered by *rootFs, which simply wraps *BasePathFs, changing the signature slightly so that it satisfies the interface, and the functionality that os.Root provides.

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[sagikazarmark]

Thanks @sean9999

I think this is a great addition!

If you don't mind, I'd like to wait for 1.25 to be released: we usually try to support two versions.

[sean9999]

If you don't mind, I'd like to wait for 1.25 to be released: we usually try to support two versions.

It's time, boss! =) https://go.dev/blog/go1.25

I had some "only v1.24" conditions in linter tests. I changed it to use >= v1.24.

I also rebased to the tip of master