New option - restore only when directory empty (or does not contain file at defined path)

[blackandred]

Let's create an option to always add the init container, and let it check if the workspace is empty or there is no file at specified path - then copy files from remote if we have an empty workspace.

Additional k3s local-path-provisioner support:

• Optional option "restoreOnNodeChange" that would trigger remote files restore when the Pod runs on a different node

This feature would allow improve tiny-scale production without network filesystem to behave like it would have a network filesystem, because moving pods between nodes will become possible and automatic - but slower.