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What happens when you run `prefect register flow --file ... --project ...`? Is the python code in the file executed?

Similarly, if I am using Prefect cloud, and a k8s agent that spawns jobs; what env vars are available when:

1. The job is starts the python file (thereby declaring the flow / DAG)
2. The flow is run


So to answer my second question; yes the python code is executed, but the flow itself isn't run. So one has to put all side-effects inside the tasks.

Third question: these <https://github.com/PrefectHQ/prefect/blob/master/src/prefect/agent/kubernetes/job_spec.yaml#L18-L39>