add docker setup

Dockerfile

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+# Arbiter Dockerfile
+# Multi-stage build for smaller final image
+
+FROM python:3.12-slim as builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
+COPY pyproject.toml ./
+RUN pip install --no-cache-dir build && \
+    pip wheel --no-cache-dir --wheel-dir /wheels -e .
+
+# Final stage
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libpq5 \
+    && rm -rf /var/lib/apt/lists/* \
+    && useradd --create-home --shell /bin/bash arbiter
+
+# Copy wheels and install
+COPY --from=builder /wheels /wheels
+RUN pip install --no-cache-dir /wheels/* && rm -rf /wheels
+
+# Copy application
+COPY src/ ./src/
+COPY templates/ ./templates/
+COPY alembic.ini ./
+
+# Set ownership
+RUN chown -R arbiter:arbiter /app
+
+USER arbiter
+
+# Environment
+ENV PYTHONPATH=/app/src \
+    PYTHONUNBUFFERED=1 \
+    ARBITER_TEMPLATES_DIR=/app/templates
+
+# Default command (API server)
+CMD ["uvicorn", "arbiter.main:app", "--host", "0.0.0.0", "--port", "8000"]
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"

docker-compose.yml

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+# Arbiter Docker Compose configuration
+# Usage:
+#   Development: docker compose up
+#   Infrastructure only: docker compose up db redis
+#   Production: docker compose -f docker-compose.yml -f docker-compose.prod.yml up
+
+services:
+  # PostgreSQL database
+  db:
+    image: postgres:16-alpine
+    container_name: arbiter-db
+    environment:
+      POSTGRES_USER: arbiter
+      POSTGRES_PASSWORD: arbiter
+      POSTGRES_DB: arbiter
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U arbiter -d arbiter"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # Redis for job queue and caching
+  redis:
+    image: redis:7-alpine
+    container_name: arbiter-redis
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis_data:/data
+    command: redis-server --appendonly yes
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # API server
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: arbiter-api
+    ports:
+      - "8000:8000"
+    environment:
+      ARBITER_DATABASE_URL: postgresql+asyncpg://arbiter:arbiter@db:5432/arbiter
+      ARBITER_REDIS_URL: redis://redis:6379/0
+      ARBITER_TEMPLATES_DIR: /app/templates
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')"]
+      interval: 30s
+      timeout: 10s
+      start_period: 10s
+      retries: 3
+    volumes:
+      - ./templates:/app/templates:ro
+
+  # Background worker
+  worker:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: arbiter-worker
+    command: ["python", "-m", "arq", "arbiter.worker.settings.WorkerSettings"]
+    environment:
+      ARBITER_DATABASE_URL: postgresql+asyncpg://arbiter:arbiter@db:5432/arbiter
+      ARBITER_REDIS_URL: redis://redis:6379/0
+      ARBITER_TEMPLATES_DIR: /app/templates
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    volumes:
+      - ./templates:/app/templates:ro
+
+  # Dashboard UI
+  dashboard:
+    build:
+      context: ./dashboard
+      dockerfile: Dockerfile
+    container_name: arbiter-dashboard
+    ports:
+      - "3000:80"
+    depends_on:
+      api:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "-q", "--spider", "http://localhost:80"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  # Database migrations (run once)
+  migrate:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: arbiter-migrate
+    command: ["python", "-m", "alembic", "upgrade", "head"]
+    environment:
+      ARBITER_DATABASE_URL: postgresql+asyncpg://arbiter:arbiter@db:5432/arbiter
+    depends_on:
+      db:
+        condition: service_healthy
+    profiles:
+      - migrate
+
+volumes:
+  postgres_data:
+  redis_data: