Use env vars in default env creation

[carolineechen]

No description provided.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: runhouse/resources/hardware/cluster.py

Function	Unhandled Issue
restart_server	ValueError: Error installing runhouse on cluster <dataset_runner> node <209.20.158.103> ... Event Count: 2
restart_server	TypeError: OnDemandCluster._start_ray_workers() got an unexpected keyword argument 'env' ... Event Count: 1

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[carolineechen]

• Use env vars in default env creation #798 👈
• main

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