drop shutdown timer because it does not work

[jschoedl]

Summary

drop azure shutdown timer because it does not work, just use manual instance shutdown instead

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

Summary by CodeRabbit

• New Features

  • Starting an environment no longer requires configuring an automatic shutdown duration.
  • The start workflow now provides the environment URL and instructs users to stop the environment when finished.

• Bug Fixes

  • Removed outdated auto-shutdown behavior and messaging from the environment startup process.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 836d3d6e-7e57-4b52-a98a-b25ba2af2e20

📥 Commits

Reviewing files that changed from the base of the PR and between 59e7682 and a438535.

📒 Files selected for processing (1)

• README.md

📝 Walkthrough

Walkthrough

The VM start workflow removes the configurable auto-shutdown duration, stops calculating and passing shutdown variables, removes the Azure auto-shutdown command, and directs operators to use Stop environment to stop billing.

Changes

VM start workflow

Layer / File(s)	Summary
Simplify workflow inputs and token setup .github/workflows/vm-start.yml	The manual trigger no longer defines minutes; OIDC token preparation and Azure CLI invocation now use only the federated token.
Remove shutdown execution and update summary .github/workflows/vm-start.yml	The Azure script no longer configures VM auto-shutdown and now reports the environment URL with instructions to run Stop environment to stop billing.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• AET-DevOps26/team-devsecops#142: Adds auto-shutdown scheduling in the same VM start workflow, which this change removes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: removing the broken shutdown timer in favor of manual shutdown.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch drop-shutdown-timer

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