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how do I set the graphql endpoint via environment variable? right now I see:
```Couldn't connect to Prefect Server at <https://localhost:4201/graphql>```
but I would like to change that

The env var should be `PREFECT_API_URL` according to this:
<https://github.com/PrefectHQ/prefect/blob/master/src/prefect/cli/docker-compose.yml>

i think maybe i figured it out... `PREFECT__SERVER__HOST` and `PREFECT__SERVER__PORT`