Missing withFileSystemBind in GenericContainer

[benkio]

Hi there,
I'm trying to use a GenericContainer, move jar on it, run the command etc etc
Then I wish to get the output result of such a command that writes on a specific container's path. On testcontainers-java I see that the GenericContainer has withFileSystemBind method that links a host's directory to a container's one.
https://github.com/testcontainers/testcontainers-java/blob/master/core/src/main/java/org/testcontainers/containers/GenericContainer.java#L1001

I was expecting to find it in the repo as the classpathResourceMapping parameter is exposed in the constructor, but found none.
Do you think is worth adding it? It should be easy and a mirror of the classpathResourceMapping
Cheers

[dimafeng]

Yes, it's definitely worth adding. I'd really appreciate if you submit a PR with that fix.