Using unbuffered output with python in docker

serial_to_mqtt_bridge/Dockerfile

@@ -3,5 +3,5 @@ FROM python:3.9
 WORKDIR /src
 COPY . .
 RUN pip install -r requirements.txt
-CMD ["python3", "./serial_to_mqtt.py"] 
+CMD ["python3", "-u", "./serial_to_mqtt.py"] 
 # Or enter the name of your unique directory and parameter set.
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