Dockerfile

FROM python:3.10-slim

# Set working directory
WORKDIR /app

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

# Install system dependencies if needed
RUN apt-get update && apt-get install -y --no-install-recommends \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first for better caching
COPY requirements.txt .

# Install Python dependencies
RUN pip install --upgrade pip && \
    pip install -r requirements.txt

# Copy application code
COPY . .

# Expose port (Railway will override with $PORT)
EXPOSE 8000

# Start command - Railway will provide $PORT environment variable
CMD uvicorn backend.main:app --host 0.0.0.0 --port ${PORT:-8000}