Fix container registry resource "oidc_authentication" examples

[OzoneNZ]

Overview

Usage examples for the new oidc_authentication attribute appear to incorrectly show it as a SingleNestedBlock type rather than a SingleNestedAttribute as described by the underlying resource schemas:

• octopusdeploy_azure_container_registry
• octopusdeploy_google_container_registry

Interestingly, the usage examples for octopusdeploy_aws_elastic_container_registry appear to be true-to-schema.

Reproduction

Minimal workspace that reproduces the schema errors upon terraform validate - though the current examples listed on registry pages also work:

terraform {
  required_providers {
    octopusdeploy = {
      source  = "octopusdeploy/octopusdeploy"
      version = "= 1.1.0"
    }
  }
}

provider "octopusdeploy" {}

resource "octopusdeploy_azure_container_registry" "test" {
  name     = "test"
  feed_uri = "test"

  oidc_authentication {
    tenant_id = "00000000-0000-0000-0000-000000000000"
    client_id = "00000000-0000-0000-0000-000000000000"
    audience  = "api://AzureADTokenExchange"
    subject_keys = [
      "space",
      "feed"
    ]
  }
}

resource "octopusdeploy_google_container_registry" "test" {
  name     = "test"
  feed_uri = "test"

  oidc_authentication {
    audience = "test"
    subject_keys = [
      "space",
      "feed"
    ]
  }
}

Resultant validation errors: