possibility to configure base docker image for functions

🚀 Feature Why the Issue My use case is a Python function which makes use of Pandas and Numpy, two widely used libraries when it comes to data analysis and manipulation. When I "preload" those libraries trough requirements.txt it bloats up the .appwrite directory and the resulting tar file to 120MB. So I have to extend the _APP_STORAGE_LIMIT variable to be able to load the function at all. Even with that "workaround" the function will not run because the Python base image is python:3.8-alpine and is missing some libraries for Pandas to run. Proposal Would it be possible to have a configuration option to set the base image of functions to something else (public or private registry). One possibility would be trough environment variables. Or any other means of "Admin" configuration would do. I understand that the image would need some extra care that in the case of Python the following would be set: Have you spent some time to check if this issu…