fix: ignore data directory in docker build

[pboyd]

Motivation and Context

I get this error when building the docker image after running the server in docker compose:

ERROR: failed to solve: error from sender: open data/diagnostic.data: permission denied

The issue is that docker-compose.yaml mounts the data directory in the mongo container which creates files that my user doesn't have access too. Except for seed.json, there doesn't appear to be a reason for those files to be in the docker build layer anyway.

This adds a .dockeringore file to exclude everything in data except seed.json.

How Has This Been Tested?

docker build

Breaking Changes

No

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context