install gpiod per default

So it won't get installed everytime the container is started.

Dockerfile

@@ -6,6 +6,7 @@ WORKDIR /var/srv/python-mqtt-gpio
 
 RUN dnf install -y libgpiod libgpiod-devel libgpiod-c++ python3-libgpiod python3-pip && \
   pip install -r /var/srv/python-mqtt-gpio/requirements.txt && \
+  pip install gpiod && \
   dnf clean all
 
 CMD [ "/usr/bin/python3", "-m", "pi_mqtt_gpio.server", "config.yml" ]