[Bug]: Unable to use .env file as expected

### What happened?

The DAB documentation states that we should put the .env file next to the config file, however, the .env file is not used unless it is in the same directory as where we run the command `dab start`.

Unsure if it is an issue related to the feature or to documentation.

https://learn.microsoft.com/en-us/azure/data-api-builder/concept/config/env-function#:~:text=Keep%20.env%20adjacent%20to%20dab%2Dconfig.json%20(or%20wherever%20your%20startup%20process%20expects%20it).

### Version

2.0.0-rc

### What database are you using?

Azure SQL

### What hosting model are you using?

Local (including CLI)

### Which API approach are you accessing DAB through?

_No response_

### Relevant log output

```Text

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### Code of Conduct

- [x] I agree to follow this project's Code of Conduct