Create a set of Dart dockerfiles

hello/bin/server.dart

+import 'dart:async';
+import 'dart:io';
+
+import 'package:http_server/http_server.dart';
+
+void main() {
+  var webFiles = new VirtualDirectory('web');
+
+  runZoned(() {
+    HttpServer.bind('0.0.0.0', 8080).then((server) {
+      server.listen((request) {
+          if (request.uri.path == '/') {
+            request.response.redirect('/index.html');
+          } else if (request.uri.path == '/version') {
+            request.response.headers..contentType = ContentType.TEXT;
+            request.response
+                ..writeln('Dart version: ${Platform.version}')
+                ..writeln('Dart executable: ${Platform.executable}')
+                ..writeln('Dart executable arguments: '
+                          '${Platform.executableArguments}')
+                ..close();
+          } else {
+            webFiles.serveRequest(request);
+          }
+      });
+    });
+  },
+  onError: (e, stackTrace) {
+    print('Error processing request $e\n$stackTrace');
+  });
+}