Feature: A way to construct a `Network` object for an existing docker network

What are you trying to do?

Attach a DockerContainer to an existing network. In my specific case, the network was created as part of a composable setup, and I'd like to attach a new container to that network.

Why should it be done this way?

I suppose my suggestion would be a way to construct a Network object by simply passing the name in as an argument. Best I can tell that name property is all that is really needed when the DockerContainer is started.

A perhaps easier way might be to create a new class

class ExistingNetwork:
    def __init__(self, network_name: str):
        self.name = network_name

While this I think could be passed into DockerContainer.with_network & it seems to work, it might be better to have this inherit Network and explicitly override the other methods in the Network class to ensure they are not called.

Bắt đầu với core/testcontainers/core/network.py, xung quanh thuộc tính name của Network, và kiểm tra DockerContainer.with_network. Xác định cách biểu diễn tên của một network hiện có mà không tạo hoặc quản lý network đó, sau đó xác minh rằng một DockerContainer có thể kết nối với network đó khi được khởi động.