Write a test that default values of env vars are correctly applied

[alyssadai]

In the past we've encountered some issues with the default values of environment variables not being applied (or being applied with the wrong values) when launching the API+graph stack, mainly when using docker compose.

A nice-to-have sanity check at some point would be a test that verifies the default values when the API is launched with Python vs. docker compose, although since the values vary slightly depending on the deployment method this likely will first involve some research into how to re-create the compose environment using pytest / actions.

[github-actions]

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