OCPBUGS-44070: adding instruction to get kubeconfig post-install

Author: rohennes

modules/ibi-create-config-iso.adoc

@@ -294,7 +294,7 @@ $ oc apply -f ibi-managed.yaml
 
 .Verification
 
-* Check the status of the `ImageClusterInstall` in the hub cluster to monitor the progress of the target host installation by running the following command:
+. Check the status of the `ImageClusterInstall` in the hub cluster to monitor the progress of the target host installation by running the following command:
 +
 [source,terminal]
 ----
@@ -311,4 +311,15 @@ target-0   HostValidationSucceeded   ClusterInstallationSucceeded  ibi-bmh
 [WARNING]
 ====
 If the `ImageClusterInstall` resource is deleted, the IBI Operator reattaches the `BareMetalHost` resource and reboots the machine.
-====
+====
+
+. When the installation completes, you can retrieve the `kubeconfig` secret to log in to the managed cluster by running the following command:
++
+[source,terminal]
+----
+$ oc extract secret/<cluster_name>-admin-kubeconfig -n <cluster_namespace>  --to - > <directory>/<cluster_name>-kubeconfig
+----
++
+* `<cluster_name>` is the name of the cluster.
+* `<cluster_namespace>` is the namespace of the cluster.
+* `<directory>` is the directory in which to create the file.