Files with --pre-archive are only copied if there are Volumes/Bind Mounts

First of all thank you for this great project. It works amazingly well.

Summary

Current behaviour: Using the --pre-archive flag only copies files if there are volumes configured.
Expected behaviour: Using the --pre-archive flag always copies files, if there are files available.

Context

The withFileSystemBind got deprecated and replaced with withCopyToContainer. As a result, most testcontainer module providers will therefore switch to using withCopyToContainer somewhere deep down in their file config helper methods, e.g.:

yourContainer = new ContainerFromModule("someImage")
    .withRamPercentage(75, 75) // some nice helper config function
    .withRealmImportFile("/your-realm.json") // some file helper function which will use `withCopyToContainer` in the end
    ...

These config files must be copied to the container before it is started. It makes therefore sense to use the --pre-archive flag to get these files copied so that we can continue profiting from these useful upstream helper functions because otherwise the alternatives are:

Use the --pre-archive flag and replace the helper functions with your own manual withFileSystemBind calls: This is not nice because you will have to do all the work of the upstream helper functions manually. See also https://github.com/joyrex2001/kubedock/issues/53.
Do not use the --pre-archive flag and therefore kubedock will copy the files after the container has already started and therefore you need to wait for the files to be copied using a custom command/entrypoint (See also https://github.com/joyrex2001/kubedock/issues/53).
Use the --pre-archive flag and a manual existing bind mount as shown below as a current work around

Current Manual Workaround

Just add an existing Bind mount and the --pre-archive flag works as expected and you can continue using the upstream testcontainer module's helper functions, e.g.:

yourContainer = new ContainerFromModule("someImage")
    .withCreateContainerCmdModifier(
         cmd ->
            cmd.getHostConfig()
            .withBinds
            (
                Bind.parse
                (
                    System.getProperty("user.dir") + "/pom.xml:/tmp/pom.xml" // any manual existing bind will do
                )
            )
    )
    ...

joyrex2001 / kubedock