Raspberry PI arm build

[wmandra]

This is really great work! I've rebuilt the docker image for arm so that it can run on a Raspberry Pi which can be found here https://hub.docker.com/r/wmandra/sense-collector

A few issues I ran into: copying in jq binary didn't work, just added jq to the apt-get install had to grab arm version of websocat (either the build script should just grab this, or download within the Dockerfile) had to disable health check as the script was missing for some reason $delay was being calculated as a negative number causing sleep to treat the value as an option, added "| awk -F- '{print $NF}'" to ensure it is always a positive number

Also noticed some items in Grafana dashboards hardcoded and removed those on my installation.