Best way to install MCP Server in a Docker container?

[tdcox]

The use case is the situation where Unity is running on a host machine (with unity-mcp installed) but Claude-code is running inside a VS Code dev container to sandbox it to only access the workplace directory.

I would like to be able to deploy the unity-mcp server component as part of the Dockerfile and claude mcp add the configuration to allow access to the Unity editor from the containerized Claude-code instance.

[tdcox]

Looks like this is tricky because the configuration is hard coded to localhost and so can't be configured to talk to host.docker.internal in order to access the host network from inside the container. Needs server.py to support input arguments.