docs: Add Okta section to supported-identity-providers

configuration/rbac-role-based-access-control/supported-identity-providers.md

@@ -17,6 +17,21 @@ Set up the auth itself first, docs [here](../authentication/oauth2.md) and [here
           value: "role-name"
 ```
 
+#### Okta
+
+You can map Okta Groups to roles.  First confirm that your okta administrator has included the `group` claim or the groups will not be passed in the auth token.
+
+Ensure `roles-field` in the auth config to `groups` and that `groups` is include in the `scope`, see [here](../authentication/oauth2.md###Okta) for more details.
+
+Configure the role mapping to the okta group:
+
+```yaml
+      subjects:
+        - provider: oauth
+          type: role
+          value: "<okta-group-name>"
+```
+
 ### Google
 
 Set up google auth [first](../authentication/oauth2.md#google)