Req : include tzdata in the image

[Gnomuz]

Could you please include tzdata in the image so that timezone can be set with the TZ variable ?

I run the container as a harvester-only on my storage NAS (Unraid). It works as expected in conjunction with a full node on another machine.
But currently, timestamps in logs from the container are UTC, and that's not easy to follow-up with logs on the other machines which are in the relevant timezone.
See basic pull request to solve this annoying issue : #50
Thanks in advance