allow azure_vm_instance_metadata in cloud_storage_credential_source for azure workload identity

[KoomeKiriinya]

https://docs.redpanda.com/25.1/manage/tiered-storage/#configure-object-storage

[CLAassistant]

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[andrewstucki]

Hi @KoomeKiriinya that schema file is actually generated from a go struct. It also looks like we're missing some other fields that are leveraged in configuring tiered storage on Azure, so I went ahead and opened up #1101 that incorporates this and adds the other fields. Thanks for bringing this to our attention!

[chrisseto]

Thanks for the PR @KoomeKiriinya! I'm going to close this in favor of Andrew's #1101.

You can also use config.cluster, which has no schema validation, to specify configuration for tiered storage:

config:
  cluster:
    cloud_storage_credentials_source: azure_vm_instance_metadata

If you need to refer to values that are stored in configmaps / secrets, you can use config.extraClusterConfiguration:

  config:
    extraClusterConfiguration:
      cloud_storage_credentials_source:
        secretKeyRef:
          name: my-secret
          key: cloud_storage_credentials_source