Create Dockerfile

Dockerfile

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+# Use an official Python runtime as a parent image
+FROM python:3.9-slim
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the current directory contents (app.py, index.html, data.json if exists)
+# into the container at /app
+COPY . /app/
+
+# Install Python dependencies
+RUN pip install --no-cache-dir Flask requests gunicorn
+
+# Make port 7860 available to the world outside this container
+# Hugging Face Spaces typically use this port for web apps
+EXPOSE 7860
+
+# Environment variable for Flask (optional, Gunicorn overrides some)
+ENV FLASK_APP=app.py
+
+# Command to run the application using Gunicorn
+# Use 1 worker for simplicity on free HF Spaces, with multiple threads.
+# Threads allow background pingers to run alongside Flask request handling.
+CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--workers", "1", "--threads", "10", "app:app"]