docs: document iPXE script variables

[rwthompsonii]

adds docs for ipxe script variables used related cloud-init.

Related issues

#5539

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

Additional Notes

docs only change

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📥 Commits

Reviewing files that changed from the base of the PR and between 689cb8c and 73aa833.

📒 Files selected for processing (2)

• docs/index.yml
• docs/provisioning/ipxe-script-variables.md

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Summary by CodeRabbit

• Documentation
  • Added an “iPXE Script Variables” page to the Provisioning documentation.
  • Documented variables provided by the PXE service, including artifact, tenant cloud-init, DPU, Scout, and deprecated cloud-init URLs.
  • Added guidance on installer usage, cloud-init payloads, empty userData, and migration to the tenant cloud-init variable.

Walkthrough

Added a Provisioning documentation page for iPXE script variables. The page describes PXE-provided URLs, cloud-init behavior, empty userData handling, and migration from ${cloudinit-url} to ${tenant-cloudinit-url}. The Provisioning navigation links to the new page.

Changes

iPXE provisioning documentation

Layer / File(s)	Summary
Document iPXE script variables docs/provisioning/ipxe-script-variables.md, docs/index.yml	Added documentation for PXE-provided iPXE variables, cloud-init payloads, empty userData handling, deprecated URL aliases, and migration guidance. Added the page to the Provisioning navigation.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 73aa8

This change only adds documentation for iPXE script variables and a navigation entry; no actionable merge-blocking risk remains.

🚥 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. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.
Title check	✅ Passed	The title clearly and concisely describes the main change: documenting iPXE script variables.
Description check	✅ Passed	The description accurately identifies this as a documentation-only change for iPXE script variables related to cloud-init and matches the changeset.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches

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• Create PR with unit tests

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