MCP in a docker world

I followed penpot/mcp at develop · penpot/penpot · GitHub to run the MCP-Server and the plugin locally and it works like a charm.

And I saw on penpot/docker/images/docker-compose.yaml at develop · penpot/penpot · GitHub that a `penpot-mcp` service was added. So I’ve tried to check it out and updated my `docker-compose.yaml` but it doesn’t work. Neither can I install the MCP-Plugin nor can I connect the MCP-Server. I think there are missing some port mappings and environment variables. And it seems that this service is server-only.

So my question is: how can it be used? Is there something missing? Any help appreciated.