use nvme store for venv on aws-gpu with pip

[leifdenby]

Describe your changes

Testing are failing on AWS (gpu) testing with pip in #118 due to running out of disk space, because I didn't set it up so that the nvme drive is used to store the virtual environment when testing install with pip (I only did this when testing the install with pdm, I should have done it for both at the time).

This PR also adds a comment to explain recent change of the cirun configuration (that was accidentally included with #123, specifically 103c8b7#diff-e81f821c9d78ca5d2124cc284d225882a2644cb071b20016e922643efbe00812R9) that was done to enlarge the root volume to 200GB to circumvent running out of disk space.

No change in dependencies.

Issue Link

#118

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• 🐛 Bug fix (non-breaking change that fixes an issue)
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