Okay, so the downtimes seem to be fixed now. I have no idea why it wasn’t fixed right after I updated the time zones in Docker, but anyway, it works now.
Here’s a Docker compose snippet on how to get the proper time zone inside the container:
volumes:
[...]
- /etc/timezone:/etc/timezone:ro
- /etc/localtime:/etc/localtime:ro
environment:
- TZ=Europe/Berlin
Display in Firefox is still off because it reports time zone offset as 0, but that’s a different problem…