fix: keycloak export script requires config, not PosixPath

[asmacdo]

Running the keycloak export script as written results in:

  File "/home/austin/devel/nebari/src/_nebari/keycloak.py", line 152, in get_keycloak_admin_from_config
    "KEYCLOAK_SERVER_URL", f"https://{config.domain}/auth/"
                                      ^^^^^^^^^^^^^
AttributeError: 'PosixPath' object has no attribute 'domain'

What does this implement/fix?

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
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• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
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[asmacdo]

side-note, as an admin, IMO it would be more convenient if these scripts were included in the nebari CLI (especially since it requires nebari and the config file). As-is, I'm just copying the scripts into my project dir so we'll miss out if they get updates.