Docker container uses hardcoded America/Chicago timezone instead of host timezone

[nnemirovsky]

The base image (ghcr.io/umputun/baseimage/app:latest) has /etc/timezone set to America/Chicago. The Docker wrapper doesn't forward the host's timezone, so all progress log timestamps show Chicago time regardless of the user's locale.

Suggestion: Have the wrapper detect the host's timezone and pass it via -e TZ=... to the container.