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Is this the right way to specify a specific url for a specific internal package? This is a part of the flow.run.config
```        env={"EXTRA_PIP_PACKAGES": "mypackage--index-url=<https://my_url>"})```

How would you pip install it?
```pip install "mypackage--index-url=<https://my_url>"```
Like that?

```pip install -i <https://myurl/mypackage>```

I am not confident that can be done because that pip install happens <https://github.com/PrefectHQ/prefect/blob/master/entrypoint.sh#L4-L5|here> . Maybe you can try typing
```"EXTRA_PIP_PACKAGES" : "-i <https://myurl/mypackage>"```
I’m not sure