Fix preshared key not persisted in config (#1474)

* replace the preshared key attribute in LoginRequest protobuff with an optional replacement

* mark old field as deprecated

* fix ui client to also keep preshared key

client/cmd/up.go

@@ -163,7 +163,6 @@ func runInDaemonMode(ctx context.Context, cmd *cobra.Command) error {
 
 	loginRequest := proto.LoginRequest{
 		SetupKey:             setupKey,
-		PreSharedKey:         preSharedKey,
 		ManagementUrl:        managementURL,
 		AdminURL:             adminURL,
 		NatExternalIPs:       natExternalIPs,
@@ -173,6 +172,10 @@ func runInDaemonMode(ctx context.Context, cmd *cobra.Command) error {
 		Hostname:             hostName,
 	}
 
+	if rootCmd.PersistentFlags().Changed(preSharedKeyFlag) {
+		loginRequest.OptionalPreSharedKey = &preSharedKey
+	}
+
 	if cmd.Flag(enableRosenpassFlag).Changed {
 		loginRequest.RosenpassEnabled = &rosenpassEnabled
 	}