Support for OIDC / Azure Workload Identity Authentication

[jusdor]

What problem are you facing?

We would like to use Workload Identity as authentication method for provider-azure, which is basically the same as OIDC authentication for a Service Principal. This is described in the azurerm terraform provider docs.

There is an example usage of this option here in the underlying provider.

How could Official Azure Provider help solve your problem?

If you could create an option in the providerConfig to use this kind of authentication resulting in the correct set of environment variables inside the pod.

[ytsarev]

cc @ulucinar

[yangyang919]

Is this enhancement getting reflected into this document: https://github.com/upbound/provider-azure/blob/main/AUTHENTICATION.md

We are trying to use this approach, but couldn't find clear guidance...