Add working example of environment based time zones

[emmuhamm]

Description

Fix #70

WIP

Add better timezone handling. This is going to be optionally done by an environment variable, which overrides the log_format.ini settings.

If no environment variables exist, use log_format.ini.

TODO:

• review the current implementation and see if youre happy with the structure of it
• Figure out what the appropriate envrionment variable should be
• how does one document this?

Type of change

• New feature or enhancement (non-breaking change which adds functionality)
• Optimization (non-breaking change that improves code/performance)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Testing checklist

• Unit tests pass (e.g. dbt-build --unittest)
• Minimal system quicktest passes (pytest -s minimal_system_quick_test.py)
• Full set of integration tests pass (dunedaq_integtest_bundle.sh)
• Python tests pass if applicable (e.g. python -m pytest)
• Pre-commit hooks run successfully if applicable (e.g. pre-commit run --all-files)

Comments here on the testing

Further checks

• Code is commented where needed, particularly in hard-to-understand areas
• Code style is correct (dbt-build --lint, and/or see https://dune-daq-sw.readthedocs.io/en/latest/packages/styleguide/)
• If applicable, new tests have been added or an issue has been opened to tackle that in the future.
  (Indicate issue here: # (issue))

[emmuhamm]

There appears to be a very stupid bug somewhere in the integ test..

Note in the following screenshots, when it is in UTC everything works well. But when its in some other time zone (eg bst) then it fails????

Obviously outside the purview of daqpytools, but it should at least still be investigated.

[emmuhamm]

How to view timezones

In [40]: import pytz
In [41]: pytz.all_timezones