allow docker cp to accept several different folders #37961

Feature request

Description

Would be nice if docker cp allowed specifying several files/folders in SRC_PATH.
My use case: I want to copy both tmp/cache and public/assets from an image, then package it to tar. If docker cp supported multiple arguments i could just use - as DEST_PATH and omit the taring altogether.

The command could look similar to how scp works: docker cp container_name:/first/path container_name:/second/path target_path