User Story:

As a user of the hcp CLI, I would like to try and set things like the default AWS region from an environment variable, `AWS_REGION`, rather than hardcoding it to `us-east-1` so that I can default the region through an environment variable rather than use the flag.

Acceptance Criteria:

Description of criteria:

• All CLI flags have an equivalent environment variable to set them

Out of Scope:

N/A

Engineering Details:

• The CLI flag will always override any default set by the environment variable or by hardcoding `us-east-`.

This requires/does not require a design proposal.
This requires/does not require a feature gate.