Don't install npm
It is no longer necessary since we were only using it for the node-based coap client
@@ -29,7 +29,6 @@ RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E03280
mosquitto \
mosquitto-clients \
net-tools \
- npm \
openjdk-8-jdk \
python-pip \
python-serial \
