Keep volume labels when cloning

[felipecruz91]

Refers to #64

[github-actions]

Docker image tag(s) pushed:

docker/volumes-backup-extension:pr-65

Labels added to images:

org.opencontainers.image.title=volumes-backup-extension
org.opencontainers.image.description=Back up, clone, restore, and share Docker volumes effortlessly.
org.opencontainers.image.url=https://github.com/docker/volumes-backup-extension
org.opencontainers.image.source=https://github.com/docker/volumes-backup-extension
org.opencontainers.image.version=pr-65
org.opencontainers.image.created=2022-09-12T15:03:48.364Z
org.opencontainers.image.revision=0cf8845e123f4062a3dc1a729dfcef55a390087b
org.opencontainers.image.licenses=Apache-2.0

[benja-M-1]

The code looks good to me 👍