Allow user to inject specific Pythons to try as step 1 during discovery #1526
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At the moment it's unnecessarily hard to specify a specific python
executable to use for a given spec. While mangling with the path
might work for environments for tox environments that require a python
differing the host tox python version; for environments matching the
host tox interpreter it's impossible to use any other interpreter than
what tox uses. Here we add a CLI argument (fallback to some environment
variable for CI usage) that allows the user to inject custom python
interpreters as step 1 of the discovery mechanism.
PS. Initially ran into this while trying to address pypa/virtualenv#1641, having multiple
pythonx.y
(framework vs non-framework) versions installed in parallel found no way to force gracefully tox to use a given one.