* Explicitly specify --no-build-isolation as that's our expectation in these tests

Previously we relied on pip to build the packages in non-PEP517 mode,
which implied no build isolation.

The latest `virtualenv` (with pypa/virtualenv#2868) won't include
`wheel` in the virtualenv, which will mean that pip uses PEP-517 mode,
which is isolated by default.

(cherry picked from commit 24e42cb)

* Add CFFI thread safety docs (#188)

* Add CFFI thread safety docs

* Delete incorrect statements

* Add more links, examples, and suggestions about TSan

* fix indentation in code example

* Update doc/source/overview.rst

Co-authored-by: Matti Picus <matti.picus@gmail.com>

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Co-authored-by: Matti Picus <matti.picus@gmail.com>
(cherry picked from commit e94a7b6)

* Explicitly specify manylinux2014 in wheel building config (#184)

(cherry picked from commit 078820c)

* Enable more Windows pytest-run-parallel CI (#189)

* enable windows pytest-run-parallel CI

* pass skip-thread-unsafe

* remove OS conditional

(cherry picked from commit 3c61e14)

* Misc CI env stabilization (#194)

* Misc CI env stabilization
* Specify explicit runner major image versions instead of `latest`.
* Test only against versioned Python releases. Installing from arbitrary source commits with `-dev` is rarely worth the potential instability between runs. Specifying X.Y with `allow-prereleases: true` will use the latest packaged X.Y.Z release, falling back to the newest X.Y.0 pre-release if X.Y.0 has not yet been released.

* correct manylinux image name typo

(cherry picked from commit 51e276e)

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Co-authored-by: Stefano Rivera <stefano@rivera.za.net>
Co-authored-by: Nathan Goldbaum <nathan.goldbaum@gmail.com>
Co-authored-by: Matti Picus <matti.picus@gmail.com>