Dockerfile

# Use an official Python runtime as a parent image
FROM python:3.10-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
# Allow statements and log messages to immediately appear in the Knative logs
ENV PYTHONIOENCODING=utf-8

# Set the working directory in the container
WORKDIR /app

# Copy the requirements file into the container at /app
COPY requirements.txt .

# Install any needed packages specified in requirements.txt
# Use --no-cache-dir to reduce image size
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Copy the current directory contents into the container at /app
# This includes app.py, index files, model_data_json directory, etc.
COPY . .

# Make port 8080 available to the world outside this container
# Hugging Face Spaces will map $PORT to this internally if needed, but Gunicorn binds to $PORT directly.
# EXPOSE 8080 is more informational here.
EXPOSE 8080

# Define the command to run the application using Gunicorn
# Gunicorn will listen on the port specified by the $PORT environment variable provided by Hugging Face Spaces.
# Use shell form for CMD to allow $PORT substitution
CMD gunicorn app:app --bind 0.0.0.0:$PORT --workers 1 --timeout 120