Add GitHub Actions workflow for Paketbox tests

[AndreasBeyer]

Summary

• add a GitHub Actions workflow that sets up Python 3.12 and runs the Paketbox test suite on pushes to main and on pull requests

Testing

• PYTHONPATH=. python3 tests/run_tests.py (fails: existing failures in the baseline test suite)

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid introducing permanently red CI job

The new workflow step at lines 22‑27 runs python3 tests/run_tests.py and fails whenever the suite is not green. At the current HEAD the command exits with seven failures in TestPaketBoxIntegration.test_simultaneous_door_operations, so this job will fail on every push to main and every pull request as soon as the workflow lands. Because the job is required and not marked continue-on-error, all future PRs will be blocked even though those failures are pre-existing. Please either fix the failing tests in the same change or make the job optional until the suite is green, otherwise the workflow cannot complete successfully for anyone.

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