[DOCS] Add documentation on how to work with environment variables

[renardeinside]

Add documentation piece on how to work with environment variables in dbx execute and in job definitions.

[vitoravancini]

is this possible?

[renardeinside]

hi @vitoravancini , yes, but a bit cumbersome. In short, there are two pieces into it:

1. providing secrets
2. providing non-secret values

As for secrets, you should use the Databricks Secrets approach and not rely on dbx.

As for non-secret values, you can do the following:

1. Add a file with env variables in dotenv format to your package, as described here
2. Load this file by path using python-dotenv package.

This is a very short summary, detailed docs are yet to be written.