opt. for docker & apt

lib/data/res/build_data.dart

@@ -2,9 +2,9 @@
 
 class BuildData {
   static const String name = "ServerBox";
-  static const int build = 165;
+  static const int build = 166;
   static const String engine =
       "Flutter 3.3.9 • channel stable • https://github.com/flutter/flutter.git\nFramework • revision b8f7f1f986 (12 days ago) • 2022-11-23 06:43:51 +0900\nEngine • revision 8f2221fbef\nTools • Dart 2.18.5 • DevTools 2.15.0\n";
-  static const String buildAt = "2022-12-04 21:41:26.055331";
-  static const int modifications = 1;
+  static const String buildAt = "2022-12-04 21:57:10.591121";
+  static const int modifications = 2;
 }

lib/data/res/error.dart

@@ -0,0 +1,28 @@
+enum ErrFrom {
+  unknown,
+  apt,
+  docker,
+  sftp,
+  ssh,
+}
+
+abstract class Err<T> {
+  final ErrFrom from;
+  final T type;
+  final String? message;
+
+  Err({required this.from, required this.type, this.message});
+}
+
+enum DockerErrType {
+  unknown,
+  noClient,
+  notInstalled,
+  invalidVersion,
+  cmdNoPrefix
+}
+
+class DockerErr extends Err<DockerErrType> {
+  DockerErr({required DockerErrType type, String? message})
+      : super(from: ErrFrom.docker, type: type, message: message);
+}