Add Docker support

[cablate]

Overview

Providing a Docker image makes it easy to run the MCP server without installing Node.js locally, and simplifies deployment in containerized environments.

Proposed Work

Dockerfile

• Multi-stage build: build stage compiles TypeScript, production stage runs only the compiled output
• Base image: node:18-alpine
• Accepts GOOGLE_MAPS_API_KEY as an environment variable at runtime
• Exposes the MCP server on the appropriate port (or stdio)

docker-compose.yml example

services:
  mcp-google-map:
    build: .
    environment:
      - GOOGLE_MAPS_API_KEY=${GOOGLE_MAPS_API_KEY}

Documentation

• Add a Docker section to README.md with build and run instructions
• Document how to pass the API key securely (env file, secrets)

Acceptance Criteria

• docker build -t mcp-google-map . succeeds
• docker run --env GOOGLE_MAPS_API_KEY=<key> mcp-google-map starts the server
• Image size is minimized via multi-stage build and .dockerignore