Feature: add DockerContainer.with_copy_file_to_container

[Lenormju]

What are you trying to do?

Describe the intention of the enhancement.

I'd like to add a file to the container I'm starting, without using volumes.

Why should it be done this way?

Feature-parity with the Java version : https://java.testcontainers.org/features/files/#copying-files

Other references:

It you deem it interesting to implement, as I do, I can implement it.

[Lenormju]

I have found this remark in a PR : #392 (comment)
Indeed, this PR was not the right place to do it, but to implement it in a new one now would be perfect 😄