Fix Docker build errors and MountedServer attribute access

[davidvasandani]

Summary

• Fixed Docker build failures due to Python 3.13 unavailability in Alpine Linux
• Resolved runtime error when accessing MountedServer attributes
• Updated Python version to 3.12 for Alpine compatibility

Problem

1. Docker build was failing with: error: No interpreter found for Python 3.13 in managed installations or search path
2. Runtime error: 'MountedServer' object has no attribute 'get'

Solution

1. Python Version: Changed from Python 3.13 to 3.12 since Alpine Linux only provides Python 3.12 packages
2. Docker Dependencies: Added python3 and py3-pip to Alpine package installation in Dockerfile
3. MountedServer Fix: Corrected attribute access from server_info.get('client') to server_info.client since MountedServer is an object, not a dictionary

Test plan

• Docker build completes successfully
• docker compose up magg-dev runs without errors
• No MountedServer attribute errors in logs
• Server starts and runs on port 8008

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