feat: add Dockerfile for local-mcp-server

[ivanilves]

Description

Add a Dockerfile for the Glean local-mcp-server to enable containerized deployment. This allows users and developers to easily build and run the MCP server in a consistent Docker environment without local Node.js setup requirements.

Related Issue

Related to #106

Motivation and Context

To enable containerized deployment of the Glean local MCP server, providing:

• Consistent runtime environment across different systems
• Simplified deployment and distribution
• Easier integration with container orchestration tools
• Reduced local setup complexity for users

Type of Change

• 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 not work as expected)
• Documentation update
• Code refactoring
• Build/CI pipeline changes
• Other (please describe): Just a Dockerfile.

How Has This Been Tested?

• Unit tests
• Integration tests
• Manual testing
• Other (please describe):
  • Successfully built Docker image using docker build -t glean-mcp-server .
  • Tested container execution in docker-compose environment
  • Verified MCP server functionality within containerized environment
  • Confirmed all dependencies are properly installed and accessible

Additional Notes

This is a non-breaking addition that:

• Does not modify existing MCP server functionality
• Uses Node.js Alpine base image for minimal footprint
• Includes proper user setup for security best practices
• Exposes standard MCP server port

Build command:

docker build -t glean-mcp-server .

[rwjblue-glean]

Overall, this seems good! Can you throw together a basic github actions workflow that ensures the Dockerfile continues to work?