Dockerfile

FROM python:3.10-slim
WORKDIR /app
# Copy only requirements first to cache dependencies layer (faster rebuilds)
COPY requirements.txt .
# Install dependencies (only reruns if requirements.txt changes)
RUN pip install --no-cache-dir -r requirements.txt
# Copy source code (changes won’t invalidate cached dependencies)
COPY . /app
CMD ["python", "server.py"]