Describe the bug
A clear and concise description of what the bug is.

Which version of the action are you using?

• v1
• v2
• Some other tag (such as v2.0.1 or master)

Environment

• self-hosted
• Linux
• Windows
• Mac

Our self hosted runners are using a Ubuntu 18.04 base distro image.

Python Versions
Please list all of the effected versions of Python (3.8.2, etc.)

• 3.7.5
• But really, any version which is not installed already to our self hosted runners.

To Reproduce
Setup workflow with the following run action:

- name: Test Setup Python
   uses: actions/setup-python@v2
   with:
      python-version: '3.7.5'

The error received is:

Create Python 3.7.5 folder
Copy Python binaries to hostedtoolcache folder
Create additional symlinks (Required for the UsePythonVersion Azure Pipelines task and the setup-python GitHub Action)
Upgrading PIP...
##[error]./python: error while loading shared libraries: libpython3.7m.so.1.0: cannot open shared object file: No such file or directory
##[error]The process '/bin/bash' failed with exit code 127

This is the same deal with other editions, during install the Python library can't be located - I'm not sure if the issue lies with the Action itself, or the packaged Python installers from https://github.com/actions/python-versions that need modification.

I have been pre-loading specific Python versions to our self hosted runner - and in those cases I've been able to set LD_LIBRARY_PATH to get installs to take - not sure if this needs to be done by default for all manifests? Example, with a Python manifest downloaded and unzipped:

export LD_LIBRARY_PATH="/home/runner/_work/_tool/Python/3.7.5/x64/lib"
bash ./setup.sh

This will successfully install.

So I wonder, is the solution to append the installed library path to LD_LIBRARY_PATH in the context of ./setup.sh to provide a hint to pip where to locate required Python libs?

E.g. here: https://github.com/actions/python-versions/blob/ca3edf54460c3581d7285dd0fba82fa7d9215b6b/installers/nix-setup-template.sh#L51

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Feels somewhat related to #115