environment identifiers

[Kapil Thangavelu]

Hi Folks,

a use case that has come up for a few users that are developing tools that
work across multiple environments is an ability to uniquely identify an
environment from within a charm. Their typically deploying a subordinate
for data aggregation and from within the subordinate need to tag the data
from the env with a unique id to disambiguate from other environments. To
support this i've added a JUJU_ENV_ID hex uuid env var that's available
from within hooks.

thoughts?

cheers,

Kapil
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