SOLVED: Migrated to Docker: can't scan libraries?

[TheDreadPirate]

Volumes don't get copied. You are mapping a host directory to a directory in the container.

Code:

--volume /path/to/media/on/host:/media

Or, if using docker compose

Code:

volumes:
      - /path/to/media/on/host:/media

Within the container /media is mapped to wherever you have your media on the host. No copying is done.