peerpods: update azure sample (usage of az role assignment create)

[nmwael]

Describe the bug

This is for azure-simple

Usually users have limited permissions and az role assignment create --assignee will fail since Graph API invocation isnt allowed. Using "az role assignment create --assignee-object-id "$USER_ASSIGNED_PRINCIPAL_ID" --assignee-principal-type "ServicePrincipal" does not require Graph API invocation.

I can rework the example and make a PR?

How to reproduce

N/A

CoCo version information

confidentialcontainers.org documentation

What TEE are you seeing the problem on

None

Failing command and relevant log output

[mythi]

"$USER_ASSIGNED_PRINCIPAL_ID"

Is this something we have available?

I can rework the example and make a PR?

sounds good to me, thanks in advance!