Unable to run docker image due to libGl error

Dockerfile

FROM python:3.6.8
COPY . /app
WORKDIR /app
RUN pip3 install --upgrade pip
RUN pip3 install opencv-python==4.3.0.38
RUN pip3 install -r requirements.txt
EXPOSE 80
CMD ["python3", "server.py"]

requirements.txt

Flask==0.12
Werkzeug==0.16.1
boto3==1.14.40
torch
torchvision==0.7.0
numpy==1.15.4
sklearn==0.0
scipy==1.2.1
scikit-image==0.14.2
pandas==0.24.2

The docker build succeeds but the docker run fails with the error

INFO:matplotlib.font_manager:Generating new fontManager, this may take some time...
PyTorch Version:  1.6.0
Torchvision Version:  0.7.0
Traceback (most recent call last):
  File "server.py", line 7, in <module>
    from pipeline_prediction.pipeline import ml_pipeline 
  File "/app/pipeline_prediction/pipeline.py", line 3, in <module>
    from segmentation_color import get_swatch_color_from_segmentation
  File "pipeline_prediction/segmentation_color.py", line 7, in <module>
    import cv2
  File "/usr/local/lib/python3.6/site-packages/cv2/__init__.py", line 5, in <module>
    from .cv2 import *
ImportError: libGL.so.1: cannot open shared object file: No such file or directory

I looked at answer import matplotlib.pyplot as plt, ImportError: libGL.so.1: cannot open shared object file: No such file or directory relating to it and replaced

import matplotlib.pyplot as plt

with

import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt

but it is not working for me. Also looked at ImportError: libGL.so.1: cannot open shared object file: No such file or directory but I do not have Ubuntu as base image so this installation would not work for me as listed in the answer.

Let me know a way to make this work.

Source: Docker Questions