Add Docker containerization and environment configuration

[Copilot]

Implements containerized development environment with LLM provider configuration management.

Changes

• .env.example: API key templates for OpenAI (sk-proj-...), Anthropic (sk-ant-api03-...), Ollama, and optional providers (Google, Cohere, HuggingFace, Azure)

• Dockerfile: Node 20-slim base with Python 3, pip, git. Conditional npm install for extensibility

• docker-compose.yml: Service definition with live volume mounts, env file loading, interactive terminal

• docs/DOCKER.md: Setup guide covering quick start, direct Docker commands, environment variables, troubleshooting (Ollama connectivity, permissions), development workflow

• README.md: Docker section with link to detailed docs and quick start snippet

• .gitignore: Excludes .env, .env.local, node_modules/

Usage

cp .env.example .env
# Add your API keys
docker compose up -d --build
docker compose exec superpowers bash

Repository mounts as volume for live development. Use host.docker.internal:11434 for local Ollama access from container.

Original prompt

Reference: b44dba7

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.