Add recert hostname arg to skip control-plane revision triggers

This change leverages recert's latest OCP post-process hostname
feature, which makes OCP's control-plane cluster operators (i.e.
etcd, kube-apiserver, kube-controller-manager, kube-scheduler)
happy, so that the latter won't trigger additional revisions. Thus
reducing the time OCP needs to stabilize after recert.

For more details please check here:
- rh-ecosystem-edge/recert#82

Signed-off-by: Michail Resvanis <[email protected]>

internal/recert/recert.go

@@ -25,6 +25,7 @@ type RecertConfig struct {
 	ForceExpire       bool     `json:"force_expire,omitempty"`
 	EtcdEndpoint      string   `json:"etcd_endpoint,omitempty"`
 	ClusterRename     string   `json:"cluster_rename,omitempty"`
+	Hostname          string   `json:"hostname,omitempty"`
 	SummaryFile       string   `json:"summary_file,omitempty"`
 	SummaryFileClean  string   `json:"summary_file_clean,omitempty"`
 	StaticDirs        []string `json:"static_dirs,omitempty"`
@@ -45,6 +46,10 @@ func CreateRecertConfigFile(clusterInfo *seedreconfig.SeedReconfiguration, seedC
 		config.ClusterRename = fmt.Sprintf("%s:%s", config.ClusterRename, clusterInfo.InfraID)
 	}
 
+	if clusterInfo.Hostname != seedClusterInfo.SNOHostname {
+		config.Hostname = clusterInfo.Hostname
+	}
+
 	config.SummaryFile = SummaryFile
 	seedFullDomain := fmt.Sprintf("%s.%s", seedClusterInfo.ClusterName, seedClusterInfo.BaseDomain)
 	clusterFullDomain := fmt.Sprintf("%s.%s", clusterInfo.ClusterName, clusterInfo.BaseDomain)