Fix broken OpenCV installation for docker container

Dockerfile

@@ -25,6 +25,10 @@ USER root
 RUN python -m venv /venv && \
     /venv/bin/pip install --no-cache-dir -r requirements.txt
 
+# Fix broken OpenCV installation for docker container
+RUN apt-get update && apt-get install -y python3-opencv
+RUN /venv/bin/pip pip install opencv-python
+
 # Set user back to non-root
 USER user