feature(kubeconfig): Do not invalidate kubeconfig upon Portainer restarting [EE-1854] (#5905)

api/http/handler/settings/handler.go

@@ -12,6 +12,7 @@ import (
 func hideFields(settings *portainer.Settings) {
 	settings.LDAPSettings.Password = ""
 	settings.OAuthSettings.ClientSecret = ""
+	settings.OAuthSettings.KubeSecretKey = nil
 }
 
 // Handler is the HTTP handler used to handle settings operations.

api/http/handler/settings/settings_update.go

@@ -148,8 +148,13 @@ func (handler *Handler) settingsUpdate(w http.ResponseWriter, r *http.Request) *
 		if clientSecret == "" {
 			clientSecret = settings.OAuthSettings.ClientSecret
 		}
+		kubeSecret := payload.OAuthSettings.KubeSecretKey
+		if kubeSecret == nil {
+			kubeSecret = settings.OAuthSettings.KubeSecretKey
+		}
 		settings.OAuthSettings = *payload.OAuthSettings
 		settings.OAuthSettings.ClientSecret = clientSecret
+		settings.OAuthSettings.KubeSecretKey = kubeSecret
 	}
 
 	if payload.EnableEdgeComputeFeatures != nil {