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Question about environment variables, if I set something like `"FOO": "BAR"` in the run config, and then do something like `os.environ["FOO"]: "BAZ"` in the flow.py - what will `FOO` bet set to when the flow runs?

I'm asking because we have a script that runs to automatically register our flows in addition to setting the run config; there's one flow where I'd like to set `PREFECT__CLOUD__HEARTBEAT_MODE` which is currently being set in the run_config. so my thought was to set it in the flow using os.environ

If you set it using `os.environ` , that needs to happen before you import prefect because when you import prefect, the context is already loaded in. It should work I think as long as you are using a script-based storage instead of pickle