opt. for docker & apt

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);
+}