fix: run az in pinned azure/cli container (Python 3.14 deadlock)

[jschoedl]

Summary

Start environment failed at "Attach public IP" because the runner's bundled Azure CLI runs on Python 3.14, which deadlocks on concurrent command-module loading (Azure/azure-cli#32980) — a flaky race, not our logic. All az commands now run inside the pinned azure/cli@v2 container (known-good CLI/Python), reusing the OIDC login. Date math stays on the host (the container image is Alpine, no GNU date).

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Infrastructure / CI
• Documentation

API changes

• This PR does not affect the API
• This PR changes the API → api/openapi.yaml updated and api/scripts/gen-all.sh re-run

Definition of Done

• CI passes
• Pre-commit hooks pass locally
• Relevant tests added or updated

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between 821c9ff and 306e286.

📒 Files selected for processing (3)

• .github/workflows/deploy-ansible.yml
• .github/workflows/vm-start.yml
• .github/workflows/vm-stop.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/azure-cli-py314-deadlock

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