CI fails to install Python 3.9 for `build-windows-python-packages`

[tbirdso]

Overview

CI checks are failing for build-windows-python-packages (9). Github Actions fails to install pip with Python 3.9.

This issue recently emerged in at least one other external module as well and is not limited to HASI (see failure in ITKShape).

Note that ".NET Framework" warnings predate this issue and are present in previous successful builds.

Expected behavior

Python versions install correctly. All CI checks succeed.

Observed behavior

In "Install Python" step:

Download https://gist.githubusercontent.com/jcfr/db7347e8708b9f32d45ab36125fad6d3/raw/8478d43e8f774c9602c78f9e81902792f923dd5c/get-pip.py Installing pip using C:\Python39-x64\python.exe Write-Error: This command cannot be run due to the error: The system cannot find the file specified. Error: Process completed with exit code 1.

EDIT - CI log for failed check in master branch is here: https://github.com/KitwareMedical/HASI/runs/2301754122

Note that the CI check passed in the original pull request but failed in subsequent merge.

[dzenanz]

Due to

Download python.org/ftp/python/3.9.4/python-3.9.4-amd64.exe
Found a python installation in a different directory [C:\hostedtoolcache\windows\Python\3.9.4\x64\] - Uninstalling
Installing C:\Downloads\python-3.9.0-amd64.exe into C:\Python39-x64\

we probably don't need to install python.

But the Write-Error: This command cannot be run due to the error: The system cannot find the file specified. probably comes from install-python.ps1, so https://github.com/scikit-build/scikit-ci-addons is the right place to resolve this bug. @jcfr do you agree?

[dzenanz]

Relevant CI log: https://github.com/KitwareMedical/HASI/pull/40/checks?check_run_id=2300036875

[tbirdso]

Verified check success.