Stork Demo uses deprecated "docker-compose" command

The Stork Demo rake target uses the "docker-compose" command, which is written in Python and (according to https://docs.docker.com/compose/release-notes/) deprecated and will not be supported after summer 2023. It is already hard to install on recent Linux systems, such as Red Hat EL 9.

The rake target should migrate to the new "docker compose" command (docker-compose V2).