Set the timezone

Hey folks,
in order to have the correct timestamp in the logs of the sealedsecrets controller container, I want to set the timezone for the container to "Europe/Berlin" (or something else).
Setting the environment variable TZ="Europe/Berlin" has no effect.
Setting the timezone with "tzselect" on the shell inside the container throws an error:
```
bash-4.4$ tzselect
/usr/bin/tzselect: line 180: /usr/share/zoneinfo/iso3166.tab: No such file or directory
/usr/bin/tzselect: time zone files are not set up correctly
```
I can't find anything in the docs.
Is there a way to give the logs the correct timestamp?
Thanks, Thomas