docker does not have libGL.so.1

[orkinyo]

Error:
raceback (most recent call last):
File "eagle-eye.py", line 13, in
from face_recog import FaceRecog
File "/EagleEye/face_recog.py", line 1, in
import cv2
File "/usr/local/lib/python3.6/dist-packages/cv2/init.py", line 180, in
bootstrap()
File "/usr/local/lib/python3.6/dist-packages/cv2/init.py", line 152, in bootstrap
native_module = importlib.import_module("cv2")
File "/usr/lib/python3.6/importlib/init.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
ImportError: libGL.so.1: cannot open shared object file: No such file or directory

Fix:
added the following line to Dockerfile

RUN apt-get install ffmpeg libsm6 libxext6 -y