docs(virtualization): update vm-image guide for golden images / vm-default-images

[myasnikovdaniil]

Summary

• Fix DataVolume name prefix: vm-image-<name> → vm-default-images-<name> (matches the actual prefix used by the vm-disk Helm chart and vm-default-images package)
• Update image catalog to the full vm-default-images package list (16 images: Ubuntu 20.04/22.04/24.04, Debian 12/13, Rocky 8/9/10, AlmaLinux 8/9/10, CentOS Stream 9/10, openSUSE Leap 15.6/16.0, Alpine 3.21)
• Add "Default Image Collection" section explaining the vm-default-images system package that auto-provisions images
• Fix kubectl tracking examples and VMDisk source example (ubuntu → ubuntu-24.04 with explicit storage: 20Gi)

Changes land in both v1.3/ and next/.

Test plan

• Netlify deploy preview renders vm-image.md correctly for both /docs/v1.3/ and /docs/next/
• DataVolume name examples match actual cluster behavior

🤖 Generated with Claude Code

Summary by CodeRabbit

Release Notes

• Documentation
  • Updated golden image documentation with improved naming conventions and enhanced resource identification for better clarity
  • Added new section documenting the collection of pre-configured default operating system images available for immediate use
  • Redesigned guidance for using golden images with explicit, detailed instructions for creating virtual machine disks and attaching them to instances

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f665bc51-d3b8-4e4a-b54b-58b34362ef85

📥 Commits

Reviewing files that changed from the base of the PR and between bc2745e and 12df12a.

📒 Files selected for processing (2)

• content/en/docs/next/virtualization/vm-image.md
• content/en/docs/v1.3/virtualization/vm-image.md

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📝 Walkthrough

Walkthrough

Documentation updates to VM image guidance across two version branches, replacing vm-image-<image> naming conventions with vm-default-images-<image> in the cozy-public DataVolume prefix. Adds "Default Image Collection" section and reorganizes golden image workflow from creation examples to custom image addition and explicit VMDisk attachment steps.

Changes

Cohort / File(s)	Summary
VM Image Documentation content/en/docs/next/virtualization/vm-image.md, content/en/docs/v1.3/virtualization/vm-image.md	Updated DataVolume naming convention from vm-image-<image> to vm-default-images-<image>, added "Default Image Collection" section describing the system package and default images, replaced "Creating Golden Images" with "Adding Custom Golden Images" guidance, and rewrote "Using Golden Images" with explicit VMDisk creation and VMInstance attachment workflow steps.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A documentation hop—
Naming schemes now unified,
Images flow with grace so clear,
From collection to disk to machine,
One consistent path appears! ✨

🚥 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 describes the main change: updating the vm-image documentation guide to reflect the new vm-default-images naming convention and structure for golden images.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch daniil/golden-images-vm-disk-source

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[gemini-code-assist]

Code Review

This pull request updates the documentation for virtual machine images in Cozystack, introducing the vm-default-images system package and its curated collection of OS images. It updates resource naming conventions to use the vm-default-images- prefix and provides revised examples for adding custom golden images and creating VMDisk resources. I have no feedback to provide.