FIX: Traefik - add local TZ environmental variable

[bcurran3]

What this PR does / why we need it:

Adds local TZ variable to Traefik container.

Looking at logs is very tedious for those of us not living in UTC!

Which issue (if any) this PR fixes:

Fixes #

Any other useful info:

[davestephens]

This should be added directly to the docker_container definition as with other containers. It'll work how it is, but is not in the right place.

[bcurran3]

Trying to do this:

    env:
      - TZ: "{{ ansible_nas_timezone }}"
      - "{{ traefik_environment_variables }}"

Results in this:

TASK [traefik : Traefik Docker Container] ******************************************************************************
fatal: [ansible-nas]: FAILED! => {"changed": false, "msg": "argument env is of type <class 'list'> and we were unable to convert to dict: <class 'list'> cannot be converted to a dict"}

Trying this:

    env:
      "{{ traefik_environment_variables }}"
      TZ: "{{ ansible_nas_timezone }}"

Results in this:

Syntax Error while loading YAML.
did not find expected key

I'm not sure how to format this correctly. I don't remember any other roles to look at for an example that use a variable to a list as well as an single env statement in the container.

It just seemed natural to me that if the container was using a variable for the environmental variables defined in defaults, that this should go to there. In fact, I like this ability to much I'm going to update some roles that have a large number of configuration options via environmental variables. My HandBrake addition comes to mind right-away.