Updated the Dockerfile.

Dockerfile

@@ -7,7 +7,12 @@ RUN rm -rf /var/cache/apk/*
 
 WORKDIR /app
 COPY app.py /app/app.py
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+ENV LISTEN_ADDRESS=0.0.0.0
+ENV LISTEN_PORT=8080
 
 EXPOSE 8080
 
-CMD ["gunicorn", "--bind", "0.0.0.0:8080", "app:app"]
+ENTRYPOINT [ "/entrypoint.sh" ]