feat: add Docker support for containerized deployment

[AlexanderNZ]

Summary

Adds Docker support and HTTP/SSE transport for containerized deployment of the IcePanel MCP Server, following the pattern established by mcp-atlassian.

Motivation

Benefits:

• No Node.js installation required on host
• Can run as a background daemon with HTTP/SSE transport
• Supports both stdio (default) and HTTP transports

Changes

New Files

Dockerfile

• Multi-stage build for minimal image size
• Stage 1: Builds TypeScript with pnpm
• Stage 2: Production runtime with Node.js 22 Alpine

.dockerignore

• Excludes node_modules, dist, .env files, and other unnecessary files from build context

src/http-server.ts

• Express server with SSE transport
• Endpoints: /sse, /messages, /health
• Session management for multiple clients

Updated Files

bin/icepanel-mcp-server.js

• Added --transport flag (stdio | sse)
• Added --port flag (default: 3000)
• Support for MCP_TRANSPORT and MCP_PORT environment variables

src/main.ts

• Support for both stdio and SSE transports

README.md

• Added Docker build and run instructions
• Added HTTP/SSE usage documentation

Usage

Stdio Transport (default)

docker run -i --rm \
  -e API_KEY="your-api-key" \
  -e ORGANIZATION_ID="your-org-id" \
  icepanel-mcp-server

HTTP/SSE Transport

docker run -d -p 9846:9846 \
  -e API_KEY="your-api-key" \
  -e ORGANIZATION_ID="your-org-id" \
  icepanel-mcp-server --transport sse --port 9846

Testing

• Verified Docker image builds successfully
• Tested stdio transport with all MCP tools ✅
• Tested HTTP/SSE transport with all MCP tools ✅