Python3.8.10 and Venv

How do I start a pod where I run a specific distribution of python (3.8.10, not just the default version in apt list, 3.8.18) and create a venv on it? I've tried to do it multiple times, but every time I start a new pod, I lose access to python3.8 and pip. This is despite the fact that I am running my pods on a network volume, so I still see the venv, but the python installation seems to disappear. Would really appreciate some help on this!
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