view CONTRIBUTING @ 44771:802ee93c205d stable

automation: support building Python 3 Inno installers

The core packaging code now supports building Python 3 installers
using PyOxidizer. Let's teach the automation code to invoke it so
that we produce both Python 2 and Python 3 based exe installers.

When publishing the artifacts, the Python 3 versions are preferred
over the Python 2 versions given their higher weight (10 versus 9).
This may be a controversial change. But I think making Python 3
the default is warranted, as it is the future. The Python 2 installers
are still fully supported and can be installed should issues with
Python 3 arise.

Differential Revision: https://phab.mercurial-scm.org/D8483

Our full contribution guidelines are in our wiki, please see:

https://www.mercurial-scm.org/wiki/ContributingChanges

If you just want a checklist to follow, you can go straight to

https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist

If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).