Feature: ryuk should be able to use TCP socket to connect to Docker engine API

What are you trying to do?

I'm trying to run testcontainers on a host with Docker Engine API exposed via TCP socket instead of a Unix socket. Testcontainers run fine but ryuk fails to start because it wants to bind mount /var/run/docker.sock into container.

Using unix socket and bind mounts is hardcoded here:

https://github.com/testcontainers/testcontainers-python/blob/e7feb53fe532b6d32d5d0c5a5d517249f8e7de50/core/testcontainers/core/container.py#L285-L293

Supporting mTLS TCP sockets would also be cool. mTLS support may be split off into another issue though.

Other references:

• Similar issue in testcontainers-java: https://github.com/testcontainers/testcontainers-java/issues/9137

从 core/testcontainers/core/container.py 的第 285-293 行开始，这里将 Unix socket 和 bind mount 硬编码了，并追踪 Ryuk 如何接收其 Docker 连接。明确 TCP socket 应如何配置和使用来替代它；对 mTLS 的支持可以单独保留。完成的标准是：当 Docker Engine 通过 TCP 而不是仅通过 /var/run/docker.sock 暴露时，Ryuk 能够连接。