Vaultwarden isnt a fork because bitwarden isn’t selfhostable. Bitwarden has an official selfhosted version. Vaultwarden is a lightweight rust version of the backend. As the selfhosted version by bitwarden is quite fat. Vaultwarden uses the official webapp of the webvault in their fork.

You can reference a single or multiple containers in a compose stack.

docker compose -f /path/to/compose.yml restart NameOfServiceInCompose