Reduce BMC API calls in applyBootOrder for empty spec.bootOrder

[atd9876]

Proposed Changes

• skip the BMC GetBootOrder call entirely when spec.bootOrder is empty
• log message should only appear when the boot order is actually modified

Fixes #907

Summary by CodeRabbit

• Bug Fixes
  • Improved BIOS boot order change detection accuracy when comparing boot order specifications and device values.
  • Optimized boot order application to skip unnecessary operations when specifications are empty.
  • Enhanced error messages for clearer feedback during boot order operation failures.
  • Added detailed logging to assist with debugging boot order update operations.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR improves boot order application logic in the server reconciler by adding an early-exit optimization for empty boot orders, refining the change detection to compare both list lengths and individual device values, updating error messages, and adding verbose logging when boot order updates are applied.

Changes

Boot Order Application Improvements

Layer / File(s)	Summary
Boot order application and error handling internal/controller/server_controller.go	applyBootOrder returns early when Spec.BootOrder is empty; change detection is improved to account for differing list lengths and per-index device values (including cases where reported order has fewer entries); GetBootOrder error message is updated; verbose logging of the computed newOrder is added when an update is applied; reconcile-level error message for boot order failures is updated.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related issues

• #907: The changes directly address this issue by short-circuiting when spec.bootOrder is empty, avoiding unnecessary GetBootOrder calls and improving update and logging behavior.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Description check	✅ Passed	The pull request description covers the main objectives but lacks detailed context about why these changes are beneficial or their impact.
Title check	✅ Passed	The title clearly summarizes the main change: reducing BMC API calls by short-circuiting when spec.bootOrder is empty, which directly matches the primary objective and code changes.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 907-server-controller-applybootorder-makes-unnecessary-bmc-api-call-every-reconcile-when-specbootorder-is-empty

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