Allow creation of virual env and installing of wheel files into this env.

[tdejager]

We need this mainly because of #32.

When we are building sdist we need create a build environment isolated from the system but using the current system interpreter so that we can build the source dist in this environment.

I'm already working on this in https://github.com/tdejager/rip/tree/feat/venv-creation. In which I'm planning to:

• Create venv using python -m venv --no-pip
• Get the correct install paths for this venv, need feat: get the system python interpreter version #77 for this
• Be able to install .whl into this venv
• Create a small test that executes a python thing in there

Currently, I want to do this with just with python -m venv but if we have the system intepreter we can create an environment without executing python if we want later on see: https://packaging.python.org/en/latest/specifications/virtual-environments/#declaring-installation-environments-as-python-virtual-environments.

Edit:

Currently ticking this off in: #82

[cnpryer]

Create a small test that executes a python thing in there

Have you thought about how you'd want to test something like this?

[tdejager]

Create a small test that executes a python thing in there

Have you thought about how you'd want to test something like this?

I actually have a simple test in this PR: #82

[tdejager]

Closing this we can re-open if we need more specific functionality.