* A pep517 build can declare build dependencies. Pip will then
know to install these dependencies before trying to build a wheel
file.

* When creating a build environment, it's only guaranteed to last
for the duration of the build process. It's not accessible once
a pip command finishes running.

* When we try to retrieve the version of a package we run a "modified"
form of "python setup.py egg_info".

* The problem with this is that we're not using the build environment
that has all the build dependencies installed (it's already gone),
so if setup.py imports a module (e.g. cython) because it expects
it to be there because it declared it as a build dependency
the egg_info command will fail.

* We don't check the RC or have a fallback case if we can't generate
egg info.

* We fail with an indecipherable IndexError.

We now have a fallback where if we can't import/run the setup.py file,
we assume the PKG-INFO file should be in the top level directory of the
sdist so we check if it's there, and if so we use that file.

…on (#259)

* fix(go version parts): remove alphabets from the version for validation

- Go versions like 1.12rc1 or 1.16beta1 are supported.
- Test added.

* fix: use regex for go versions

…indows (#282)

…json (#284)

* Allow nodejs to build without requiring a manifest

* Fix existing tests

* Remove expected .package-lock

* Define actions in the scope they're used

Co-authored-by: Mathieu Grandis <[email protected]>