Add local docker container support to smithery.yaml configuration

[arjunkmrm]

Smithery maintainer here! Sending a PR to add local Docker container support to the smithery.yaml configuration.

Changes:

• Updated commandFunction to use the published Docker image
• Added optional MySQL port parameter with default value
• Set PYTHONPATH environment variable to ensure proper module loading

Test:

• Claude:

{
  "mcpServers": {
    "mysql": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e", "MYSQL_HOST=host.docker.internal",
        "-e", "MYSQL_PORT=3306", 
        "-e", "MYSQL_USER=testuser",
        "-e", "MYSQL_PASSWORD=testpass",
        "-e", "MYSQL_DATABASE=testdb",
        "smithery/mysql-mcp-server:latest"
      ]
    }
  }
}