Read MAPBOX_API_KEY from environment

[frafra]

All the settings are read from environment variables, except MAPBOX_API_KEY, which requires modifying superset_config.py.
https://github.com/apache/superset/blob/master/docker/pythonpath_dev/superset_config.py

https://github.com/apache/superset/blob/a330b664c13e34a4c7ca954f9a3a527a43a5535f/docs/src/pages/docs/frequently-asked-questions-page.mdx#why-is-the-map-not-visible-in-the-geospatial-visualization

It would be better just to add MAPBOX_API_KEY = get_env_variable("MAPBOX_API_KEY") somewhere in superset_config.py and add MAPBOX_API_KEY='' in docker/.env* files, and update the documentation accordingly.

[Lawful2002]

@frafra I would like to work on this issue if it is still open.

[frafra]

@Lawful2002 sure, it is yours :)

[stale]

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[frafra]

Not stale.