feat: add support for defining localtime via volume

[nijel]

Proposed changes

Docker engine follows symlinks when creating the volume what makes /tmp/localtime read-only. But user has apparently configured timezone in this case so we can skip this step.

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

@FSeidinger-XI This should fix your issue.