RHIDP-5351: Add command to validation step

Author: linfraze

modules/installation/proc-install-rhdh-airgapped-environment-ocp-helm.adoc

@@ -190,8 +190,15 @@ helm install rhdh ./mirror-archive/oc-mirror-workspace/src/charts/redhat-develop
 
 .Verification
 . To verify that all resources are successfully deployed and running, check the status of your deployments and pods in the cluster.
-. To validate the route, ensure that the route matches the expected URL based on the router base of the cluster.
-.. If necessary, update the route to align with your expected configuration.
+. View the router base URL by entering the following command:
++
+[source,terminal,subs="attributes+"]
+----
+CLUSTER_ROUTER_BASE=$(oc get route console -n openshift-console -o=jsonpath='{.spec.host}' | sed 's/^[^.]*\.//')
+helm install redhat-developer-hub./mirror-archive/oc-mirror-workspace/src/charts/redhat-developer-hub-1.4.1.tgz \
+    --set global.clusterRouterBase="$CLUSTER_ROUTER_BASE"
+----
+. Ensure that the route matches the expected URL based on the router base of the cluster. If necessary, update the route to align with your expected configuration.
 
 [role="_additional-resources"]
 .Additional resources