try to use dart as backend language

server/cinema/pubspec.yaml

@@ -0,0 +1,18 @@
+name: cinema
+description: A server app using the shelf package and Docker.
+version: 1.0.0
+# repository: https://github.com/my_org/my_repo
+
+environment:
+  sdk: ^3.9.0
+
+dependencies:
+  image: ^4.5.4
+  shelf: ^1.4.2
+  shelf_router: ^1.1.2
+  shelf_web_socket: ^3.0.0
+
+dev_dependencies:
+  http: ^1.2.2
+  lints: ^6.0.0
+  test: ^1.25.6