Populating Juju controller config no longer immediately fails if Juju CLI does not exist #362
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Description
Populating Juju controller config will fail if the Juju CLI does not exist. This PR changes that behaviour to attempt to fill the config using environment variables. Only if environment variables are incomplete will the function error.
Fixes: #340.
Type of change
Environment
Juju controller version: 2.9.47
Terraform version: v1.5.7
QA steps
Manual QA steps should be done to test this PR.