Added g++ to dockerfile

Author: MirkoZETA

Dockerfile

@@ -3,6 +3,7 @@ WORKDIR /app
 
 COPY requirements.txt ./
 RUN pip install --no-cache-dir -r requirements.txt
+RUN apt-get update && apt-get install -y --no-install-recommends build-essential
 
 
 COPY backend.py ./