增加任务取回功能

cmd/saastool/task.go

@@ -25,6 +25,8 @@ func RunTask(args ...string) error {
 		return RunTaskInfo(args...)
 	case "upload":
 		return RunTaskUpload(args...)
+	case "download":
+		return RunTaskDownload(args...)
 	case "run":
 		return RunTaskRun(args...)
 	default:
@@ -51,6 +53,7 @@ Commands:
     delete               Delete a task on server
     info                 Get a task info on server
     upload               Upload task's file block to server
+    download             Download task's file block to local
 
 "help" is the default command.