Add ADDITIONAL_PYTHON_DEPS to the image

[potiuk]

Description

Since we have separate "build" segment for the production image, We will need to add any extra dependencies there rather than on top of the base image if someone wants to add those dependencies.

Use case / motivation

The initial idea was to be able to extend the image with some extra dependencies but since the production image is optimized for size it does not have a lot of the dependencies that are needed to build it (build-essentials for one) so those dependencies will have to be added in the build segment.