Provider upgrades fail to build python sdk with error about venv

[VenelinMartinov]

Observed in pulumi/pulumi-rancher2#604. Provider upgrades seem to fail with an error in build_python:

make build_python
cd sdk/python/ && \
		rm -rf ./bin/ ../python.bin/ && cp -R . ../python.bin && mv ../python.bin ./bin && \
		rm ./bin/go.mod && \
		python3 -m venv venv && \
		./venv/bin/python -m pip install build==1.2.1 && \
		cd ./bin && \
		../venv/bin/python -m build .
Error: [Errno 2] No such file or directory: '/Users/vvm/code/pulumi-rancher2/sdk/python/venv/bin/python3'
make: *** [.make/build_python] Error 1

To repro checkout rancher2 at 43c8d3b and run upgrade-provider

Reverting ci-mgmt to before #1151 unblocked the upgrade.

[danielrbradley]

Could you link to the job that was throwing the error? The linked upgrade issue only links to upgrade jobs which have failed due to it being a major version upgrade.

[VenelinMartinov]

The error showed up when running the upgrade locally with upgrade-provider --major - CI fails due to the major version upgrade

[danielrbradley]

This doesn't appear to happen when running the make commands directly.

To move this forward we need a repro which doesn't involve running upgrade-provider because that tool requires too much external state. It also seems to cause a bunch of the logs to be missing from the make commands.