OCPBUGS-32227:adding Butane installation step

Author: brendan-daly-red-hat

modules/ipi-install-configuring-ntp-for-disconnected-clusters.adoc

@@ -23,6 +23,12 @@ image::152_OpenShift_Config_NTP_0421.png[Configuring NTP for disconnected cluste
 {product-title} nodes must agree on a date and time to run properly. When compute nodes retrieve the date and time from the NTP servers on the control plane nodes, it enables the installation and operation of clusters that are not connected to a routable network and thereby do not have access to a higher stratum NTP server.
 
 .Procedure
+. Install Butane on your installation host by using the following command:
++
+[source,terminal]
+----
+$ sudo dnf -y install butane
+----
 
 . Create a Butane config, `99-master-chrony-conf-override.bu`, including the contents of the `chrony.conf` file for the control plane nodes.
 +