Update Dockerfile

Dockerfile

@@ -5,8 +5,8 @@ WORKDIR /app
 # Copy the current directory contents into the container at /app
 COPY . /app
 
-# Install any needed packages specified in requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt
+RUN apt-get update && apt-get install -y libgl1-mesa-glx
 
 # Make port 80 available to the world outside this container
 EXPOSE 7860