support docker image management

lib/data/model/docker/image.dart

@@ -0,0 +1,47 @@
+final _dockerImageReg = RegExp(r'(\S+) +(\S+) +(\S+) +(.+) +(\S+)');
+class DockerImage {
+  final String repo;
+  final String tag;
+  final String id;
+  final String created;
+  final String size;
+
+  static final Map<String, DockerImage> _cache = <String, DockerImage>{};
+
+  DockerImage({
+    required this.repo,
+    required this.tag,
+    required this.id,
+    required this.created,
+    required this.size,
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      'repo': repo,
+      'tag': tag,
+      'id': id,
+      'created': created,
+      'size': size,
+    };
+  }
+
+  factory DockerImage.fromRawStr(String raw) {
+    return _cache.putIfAbsent(raw, () => _parse(raw));
+  }
+
+  static DockerImage _parse(String raw) {
+    final match = _dockerImageReg.firstMatch(raw);
+    if (match == null) {
+      throw Exception('Invalid docker image: $raw');
+    }
+    return DockerImage(
+      repo: match.group(1)!,
+      tag: match.group(2)!,
+      id: match.group(3)!,
+      created: match.group(4)!,
+      size: match.group(5)!,
+    );
+  }
+}
+