FROM python:3.10-slim

WORKDIR /app

# System dependencies for Postgres & builds
RUN apt-get update \
 && apt-get install -y gcc libpq-dev --no-install-recommends \
 && rm -rf /var/lib/apt/lists/*

# Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY . .

# Expose Flask port
EXPOSE 3000