[docs] [issue30487] DOC: automatically create a venv and install Sphinx when running make

[Zachary Ware]

Zachary Ware <zachary.ware at gmail.com> added the comment:

You should be able to force-push your branch (`git push -f origin auto-venv-docbuilder`, or replace `origin` with the correct remote name) to fix the existing PR.

Sorry I haven't gotten back to this previously; time to do a review and remembering that the PR exists have not coincided.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30487>
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