The wonderful *ipapi.co* service can help identify the time zone of a
device based on the geolocation information for its IP address. We can
use this to set the `TZ` environment variable in the user session, which
Firefox will respect. This has the effect of showing the correct time
in e.g. Grafana dashboards, without hard-coding the time zone in the
rootfs image.
Dustin C. Hatch
878f733025