Switch the CLI to use the new "docker compose"

[asishallab]

For those who remember: "Raider heißt jetzt Twix, sonst ändert sich nix."

Fix the CLI

Installing latest Docker now comes with a "Docker plugin".
So instead of using docker-compose with a "-" we now need to use docker compose
without a "-".

Please provide comprehensive error messages in case the CLI does not find tools it expects to be present, like e.g. docker compose (without the dash).

Fix integration tests

So, we need to fix integration tests, probably, too. Search the code base with e.g. ripgrep recursively for docker-compose and thus find the places where we need to fix this issue, too.

Guidelines

Please fix in a separate branch, test, and provide a pull request.