Open stdin option for container request

[0xF0D0]

I've added open_stdin option on container request.

Ping me if any tests should be added.

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[DDtKey]

Hi @0xF0D0 and thanks for the contribution!

May I ask you to provide some details about your use-case? Do you try to use some cli-based container?
Doesn't exec functionality cover your needs?

[0xF0D0]

Not quite actually.
First things first, what I'm trying to do here is using testcontainer-rs is writing integration tests with containers while mimicking network by stdin, stdout. From each container's perspective, input packets are passed from stdin, and send output packets to stdout.

so AFAIK exec does not hook every stdout so I had to turn this stdin option.

Here's my sample code

        let docker_client = testcontainers::core::client::docker_client_instance()
            .await
            .unwrap();
        let result = docker_client
            .attach_container(
                &node_name,
                Some(AttachContainerOptions {
                    stdin: true,
                    detach_keys: None,
                    logs: false,
                    stream: true,
                    stdout: false,
                    stderr: false,
                }),
            )
            .await
            .unwrap();

        let mut stdin = result.input;

this stdin does not work unless I turn this open_stdin option.

I was also wondering if could add stdin just like stdout but seemed like it would change far more codes than this pr so I felt I should ask how you feel about this change.