install cv2 in Dockerfile

Dockerfile

@@ -9,6 +9,10 @@ COPY ./requirements.txt /code/requirements.txt
 
 RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
 
+# Install OpenCV to combat the error: "ImportError: libGL.so.1: cannot open shared object file: No such file or directory"
+RUN apt-get update && apt-get install -y python3-opencv
+RUN pip install opencv-python
+
 COPY . .
 
 RUN useradd -m -u 1000 user