feat: support copy files to container

[guenhter]

This PR supports copying files into the container like this:

let container = GenericImage::new("alpine", "latest")
        .with_wait_for(WaitFor::seconds(2))
        .with_copy_to("/tmp/somefile", "foobar".to_string().into_bytes())
        .start()
        .await?;

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[DDtKey]

Hi there 👋

Thank you a lot for the contribution 👍

However it would be nice to rationalize the need and discuss the proposal before putting an effort 🙏

So, I guess mountfunctionality doesn't cover your needs? You want a full independent copy of files, right? So we will have both mounting and copy features (like in Java version)

[guenhter]

Hi,

the rational behind is specially when using Docker In Docker environments with the docker-socket mounted. Here, copying files to the container instead of mounting them is way easier and less error prone. This is one of the main reasons why this is needed.

[DDtKey]

the rational behind is specially when using Docker In Docker environments with the docker-socket mounted. Here, copying files to the container instead of mounting them is way easier and less error prone. This is one of the main reasons why this is needed.

I actually think it's a useful feature, so I don't mind for sure.
It's just always a shame and sad that a person has made a lot of effort, but the PR is not accepted for some other reason

That's why I prefer to have at least a short issue to have visibility

[guenhter]

Completely understandable. Next time, I'll raise an issue first for discussion.

[kiview]

Just to chime in quickly from a meta Testcontainers perspective:
Copy file is indeed preferred over mounting (and available as an API in other languages as well, in Java we even deprecated the mounting API, in favor of the copy API), exactly because of the reasons outlined by @guenhter. The copy approach is extremely portable across all kind of different Docker setup (e.g. socket mounting, or remote Docker daemon).

[DDtKey]

Thank you for the contribution and patience during the review process ❤️

[guenhter]

Thanks for all the help. I realy appreciate your effort.