Feature: make the chart compatible with GeoNode project based images

[AlexGacon]

Feature Description

One of the recommended way to deploy GeoNode is to create a GeoNode project based on the GH repo https://github.com/GeoNode/geonode-project.

The GeoNode docker images built with this solution differs in with the standard images. Normally a different entry point should be called (stored in /usr/src/my_project/entrypoint.sh) and the tasks.py used for the invoke command is the one stored in /usr/src/my_project/tasks.py).

Since the K8s custom tasks.py is mounted on /usr/src/geonode/tasks.py, when used with the custom images, it is not taken into account.

Proposed Solution

A first solution could be to be able to configure the mount path of the tasks-py volume. Perhaps there are other differences to investigate.

Additional Information

Any additional information or context that may be helpful in implementing the feature.