Docs: how does rsconnect choose a Python version

[lachlansimpson]

The documentation for rsconnect-python has information on how Connect selects a Python version, but not on how rsconnect selects a version when deploying.

I have a vague feeling that the version of Python is decided by the environment from which the command is run - i.e., the first version of Python found on the PATH when using rsconnect deploy...

The section titled Creating a Manifest for Future Deployment alludes to this, but it is no where made explicit:

It will contain the package dependencies from the current Python environment, or from an alternative Python executable specified in the --python option.

https://docs.posit.co/rsconnect-python/#creating-a-manifest-for-future-deployment

I think we (Support, end users) would benefit from making this information explicit.