chore: upgrade FRI Dockerfile from Python 3.6 to 3.10 (fixes #270)

[GaneshPatil7517]

@pradeeban

Summary

This PR upgrades the FRI Dockerfile from Python 3.6 (EOL) to Python 3.10.

Python 3.6 reached end-of-life in December 2021 and no longer receives security updates. Continuing to use it exposes the container to unpatched vulnerabilities.

Additionally, the FRI README specifies Python 3.10, creating a mismatch between documentation and implementation.

Changes Made

• Updated base image:
  • FROM python:3.6-slim
    → FROM python:3.10-slim

Benefits

• Aligns Dockerfile with documentation
• Uses actively supported Python version
• Reduces security risk from unpatched CVEs
• Improves long-term maintainability

Scope

• Single-line change
• No modifications to concore-lite
• No Verilog changes
• No functional logic changes

Testing

• Verified Docker build completes successfully (docker build -t fri-test ./fri — all 7 stages passed)
• Confirmed compatibility with existing dependencies (Flask, gunicorn 20.1.0, flask-cors, jupyterlab, PyGithub)

Fixes #270

[Copilot]

Pull request overview

Upgrades the FRI container runtime to a supported Python version, aligning the Dockerfile with the FRI documentation and addressing issue #270 regarding Python 3.6 EOL/security exposure.

Changes:

• Update fri/Dockerfile base image from python:3.6-slim to python:3.10-slim.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.