Dockerfile

FROM python:3.11-slim

# Set work directory
WORKDIR /app

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PYTHONPATH=/app

# Install system dependencies
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        gcc \
        libc6-dev \
        libpq-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first for better Docker caching
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy project files
COPY . .

# Create directories
RUN mkdir -p logs data/encrypted_messages

# Create non-root user
RUN groupadd -r appuser && useradd -r -g appuser appuser
RUN chown -R appuser:appuser /app
USER appuser

# Expose port
EXPOSE 5000

# Default command
CMD ["python", "app/main.py"]