message: docs: Add kubernetes azure auth provider section
diff: @@ -28,6 +28,28 @@ The providers available as server side are:
  - `localKubectlProxy`
  - `serviceAccount`
  +### Azure
  +
  +The Azure server side authentication provider works by authenticating on the server with
  +the Azure CLI `az login`, meaning any user that can access the backstage app will have
  +the same level of access to the cluster in the Kubernetes plugin, to put an example, even
  +guest users would have access to the cluster resources.
  +
  +```yaml
  +kubernetes:
  + clusterLocatorMethods:
  + - type: 'config'
  + clusters:
  + - name: Random cluster name in backstage
  + url: ${AZURE_CLUSTER_API_SERVER_ADDRESS}
  + authProvider: azure
  + skipTLSVerify: true
  +```
  +
  +To get the API server address for your Azure cluster, go to the Azure console page for the
  +cluster resource, go to `Overview` > `Properties` tab > `Networking` section and copy paste
  +the API server address directly in that `url` field.
  +
  ## Client Side Providers
  These providers authenticate your _user_ with the cluster. Each Backstage user will be
  