[issue46789] Restore caching of externals on Windows buildbots

[Jeremy Kloth]

Jeremy Kloth <jeremy.kloth at gmail.com> added the comment:

> Would it be possible to create a download cache somewhere outside the Python source tree, so "git clean -fdx" would not remove this cache?

I was thinking of locating it next to the checkout directory.  The
current structure is:

[worker root]
-- [builder root]
---- [checkout]

I propose to add the externals directory within the builder root, so
each branch would still have a unique copy.

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nosy: +jeremy.kloth

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<https://bugs.python.org/issue46789>
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