Add Docker support for running skillport-mcp in HTTP mode

[abnerjacobsen]

Summary

• Adds a production-ready Docker setup to run skillport-mcp in Remote (HTTP) mode (default: 0.0.0.0:3000).
• Includes a multi-stage Dockerfile.mcp based on Astral’s uv image, plus a helper build script.
• Documents build/run instructions for both HTTP (default) and STDIO (override) usage.

Details

• Dockerfile.mcp: Multi-stage build using uv, installs the workspace and exposes port 3000. Default command starts:
  skillport-mcp --http --host 0.0.0.0 --port 3000
• scripts/build-mcp-docker.sh: Convenience script to build/tag the Docker image and print example docker run commands.
• DOCKER_MCP.md: Quickstart documentation for Docker usage.
• .dockerignore: Keeps the Docker build context minimal and predictable.

Configuration Notes

• SKILLPORT_SKILLS_DIR is expected to be provided via environment variables (typically pointing to a mounted volume).
• Default MCP HTTP endpoint becomes available at: http://:3000/mcp

Motivation

• This makes it straightforward to deploy skillport-mcp as a containerized HTTP service, enabling remote MCP usage without requiring local uv tooling on the host machine.

[gotalab]

Thanks for the awesome PR!
I'll review it tomorrow or the day after.