Allow setting TZ environment variable

[michaelfig]

Is this a BUG REPORT or FEATURE REQUEST?

FEATURE REQUEST

I would like to have a Cluster resource option for setting the mysql daemon's TZ environment variable. Such as:

apiVersion: mysql.oracle.com/v1alpha1
kind: Cluster
metadata:
  name: mysql
spec:
  timezone: America/New_York

This is useful for supporting specifying the default timezone without running into bootstrap issues, if say, the default-timezone setting is used in my.cnf (which causes mysqld to fail to start before the mysql_tzinfo_to_sql has run).

Thanks,
Michael.