include the airgap registry cluster IP in the node join response (#4553)

* include the airgap registry cluster IP in the node join response

* use kotsutil.GetEmbeddedRegistryCreds

pkg/handlers/embedded_cluster_node_join_command.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/replicatedhq/kots/pkg/embeddedcluster"
 	"github.com/replicatedhq/kots/pkg/k8sutil"
+	"github.com/replicatedhq/kots/pkg/kotsutil"
 	"github.com/replicatedhq/kots/pkg/logger"
 	"github.com/replicatedhq/kots/pkg/store"
 	"github.com/replicatedhq/kots/pkg/util"
@@ -24,6 +25,8 @@ type GetEmbeddedClusterNodeJoinCommandResponse struct {
 	EndUserK0sConfigOverrides string `json:"endUserK0sConfigOverrides"`
 	MetricsBaseURL            string `json:"metricsBaseURL"`
 	EmbeddedClusterVersion    string `json:"embeddedClusterVersion"`
+	AirgapRegistryAddress     string `json:"airgapRegistryAddress"`
+	IsAirgap                  bool   `json:"isAirgap"`
 }
 
 type GenerateEmbeddedClusterNodeJoinCommandRequest struct {
@@ -163,6 +166,11 @@ func (h *Handler) GetEmbeddedClusterNodeJoinCommand(w http.ResponseWriter, r *ht
 		ecVersion = install.Spec.Config.Version
 	}
 
+	airgapRegistryAddress := ""
+	if install.Spec.AirGap {
+		airgapRegistryAddress, _, _ = kotsutil.GetEmbeddedRegistryCreds(client)
+	}
+
 	JSON(w, http.StatusOK, GetEmbeddedClusterNodeJoinCommandResponse{
 		ClusterID:                 clusterID,
 		K0sJoinCommand:            k0sJoinCommand,
@@ -171,5 +179,7 @@ func (h *Handler) GetEmbeddedClusterNodeJoinCommand(w http.ResponseWriter, r *ht
 		EndUserK0sConfigOverrides: endUserK0sConfigOverrides,
 		MetricsBaseURL:            install.Spec.MetricsBaseURL,
 		EmbeddedClusterVersion:    ecVersion,
+		AirgapRegistryAddress:     airgapRegistryAddress,
+		IsAirgap:                  install.Spec.AirGap,
 	})
 }