Unable to import module 'app': No module named '_tkinter'", "errorType": "Runtime.ImportModuleError"

Hi,

I am trying to create a docker containers that will run on lambda but I continuously get the error: [Unable to import module 'app': No module named '_tkinter'", "errorType": "Runtime.ImportModuleError" on running the container.

I am sharing the my Dockerfile below:

```base
FROM public.ecr.aws/lambda/python:3.8
RUN yum -y update
RUN yum -y install gcc
RUN yum install -y gcc-c++
RUN yum install -y git
RUN yum install -y which
COPY requirements.txt ./requirements.txt
RUN pip install -r requirements.txt \
&& pip install -e git+https://github.com/ganesh3/icevision.git@master#egg=icevision[inference] --upgrade
RUN mkdir -p ./fonts/
RUN curl -LJO https://raw.githubusercontent.com/airctic/storage/master/SpaceGrotesk-Medium.ttf
RUN cp SpaceGrotesk-Medium.ttf ./fonts/
RUN yum install -y tkinter tcl-devel tk-devel
COPY model_dir ./model_dir
COPY /app/app.py ./
CMD ["app.handler"]
```

The requirements.txt:

```base
--find-links https://download.pytorch.org/whl/torch_stable.html
torch==1.10.0+cpu
torchvision==0.11.1+cpu
--find-links https://download.openmmlab.com/mmcv/dist/cpu/torch1.10.0/index.html
mmcv-full==1.3.17
mmdet==2.17.0
```

The tkinter package is a basic package in python and hence required but even after installing it is not able to find the package. I logged in to the docker container using the below:

```base
docker exec -it sh
```
Then I logged into the python shell and ran:

```base
>>> import tkinter
Traceback (most recent call last):
File "", line 1, in
File "/var/lang/lib/python3.8/tkinter/__init__.py", line 36, in
import _tkinter # If this fails your Python may not be configured for Tk
ModuleNotFoundError: No module named '_tkinter'
```

I ran the following in the python shell:

```base
import subprocess
subprocess.call(['pip', 'install', 'tk'])
```

I also ran the following to install tkinter:

```base
yum install -y tkinter
yum install -y python3-tkinter
```
Nothing seems to work and looks like the was lambda python runtime needs to have this package to run python smoothly. Can someone please suggest?

Warm Regards
Ganesh Bhat