After starting an interactive session in the container I tried to install tkinter with: pip3 install tk and it seems to be successfully installed:
Collecting tk
Downloading tk-0.1.0-py3-none-any.whl (3.9 kB)
Installing collected packages: tk
Successfully installed tk-0.1.0
After that, I started a Python3 interpreter and tried to import tkinter using : from tkinter import * but it did not work ModuleNotFoundError: No module named 'tkinter'. However, when I imported it outside the container with the same line of code from tkinter import * it did work since it is a standard Python library. Knowing that I tried to install another libraries like seaborn and they just work fine.