Add tzdata to Nomad Docker image for out of the box DST support

[elrzn]

Hi everyone,

As documented periodic.time_zone makes use of Go's LoadLocation() which needs the time zone database to be available.

https://developer.hashicorp.com/nomad/docs/job-specification/periodic#time_zone https://developer.hashicorp.com/nomad/docs/job-specification/periodic#daylight-saving-time

At the moment, this isn't included in the Nomad Docker image. This means we're limited to UTC and can't make use of Daylight Saving Time adjustments.

Would it be possible to add the tzdata package to the Docker image by default?

Thanks for considering this!