Is your feature request related to a problem? Please describe.

We are deploying Polaris into k8s environment, where we provide a ServiceAccount with correct permissions to access bucket/db/etc via IRSI (for AWS) or WebIdentity (for GCP). Having an extra required role_arn for catalog is redundant and forces to generate extra role, with similar permissions just to be able to configure it. Also, role_arn is not needed for minio.

Describe the solution you'd like

Make role_arn optional. Use AWS DefaultCredentialsProvider for getting credentials.

Describe alternatives you've considered

No response

Additional context

No response