Don't try to join a cluster that we are already a member of.

[cjohnston1158]

Fixes: LP:#2069672

Description

Currently, the charm has the ability to attempt to re-join a cluster that it is already a member of. Most likely this is due to the setup not being completed prior to trying to rejoin. I suspect possibly on less than ideal hardware.

Fixes #2069672

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] CleanCode (Code refactor, test updates, does not introduce functional changes)
• [ ] Documentation update (Doc only change)

How Has This Been Tested?

NOTE: All functional changes should accompany corresponding tests (unit tests, functional tests etc).

Please describe the addition/modification of tests done to verify this change. Please also list any relevant details for your test configuration.

Contributor's Checklist

Please check that you have:

• [x] self-reviewed the code in this PR.
• [ ] added code comments, particularly in hard-to-understand areas.
• [ ] updated the user documentation with corresponding changes.
• [ ] added tests to verify effectiveness of this change.

[hemanthnakkina]

/canonical/self-hosted-runners/run-workflows fe10e9efc6c3773b9accde6f4bb4401c252b1dc8