Dockerfile

# Use an official Python runtime as a parent image
FROM python:3.9-slim

# Set environment variables
# Prevents Python from writing pyc files to disc (equivalent to python -B option)
ENV PYTHONDONTWRITEBYTECODE 1
# Prevents Python from buffering stdout and stderr (equivalent to python -u option)
ENV PYTHONUNBUFFERED 1

# Set the working directory inside the container
WORKDIR /app

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

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

# Copy the Flask app files into the container
COPY . /app/

# Expose port 5000 for the Flask app to listen on when running within the container
EXPOSE 5000

# Define the command to start the container. Use gunicorn as the WSGI server to serve the Flask app
# CMD ["gunicorn", "--bind", "0.0.0.0:5000", "app:app"]
CMD ["python", "app.py"]