Hopefully better Linux IP address detection
Hopefully better Linux IP address detection

The old command to detect IP addresses on Linux was `ip route get 8.8.8.8 | awk '{print $NF; exit}'`,
but that did not work on my machine or the default Ubuntu docker image I tested. It turns out that `ip route` does not
appear to have standardized output across different versions and distros. I found this alternate option that is hopefully
standardized and installed by any sane Linux distro to give us the internal ip address for the setup scripts.
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