FROM python:3.9-slim-buster
WORKDIR /app

# Install dependencies first for layer caching
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application code
COPY . .

# Expose the port Gunicorn will listen on
EXPOSE 8000

# Run the application with Gunicorn
CMD ["gunicorn", "--bind", "0.0.0.0:8000", "my_app.wsgi:application"]