release-targets/standard-support.manual: add UEFI desktops + plain cloud

[igorpecovnik]

Summary

• Add UEFI desktop variants for all supported DEs covering both amd64 and arm64 not yet present: kde-plasma, mate, xfce, i3-wm (Ubuntu only, per request).
• Add plain cloud kernel entries (no extensions) for both uefi-arm64 and uefi-x86 to the existing minimal-stable-ubuntu-current-uefi block.
• Each new desktop block follows the same shape as the existing cinnamon/gnome variants: BRANCH: current with v4l2loopback-dkms (arm64) and v4l2loopback-dkms,nvidia (x86).

Test plan

• Generated targets-release-standard-support.yaml includes the four new desktop targets.
• Generated cloud entries do not carry ENABLE_EXTENSIONS.
• No regression in existing gnome/cinnamon UEFI desktop builds.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ae5283d6-9444-4738-868c-a2b54a1c3012

📥 Commits

Reviewing files that changed from the base of the PR and between 6dba921 and aafcbce.

📒 Files selected for processing (1)

• release-targets/targets-release-standard-support.manual

Walkthrough

This PR modifies the release targets configuration file to extend UEFI build support. The minimal-stable-ubuntu-current-uefi target is updated with two additional cloud branch items (uefi-arm64 and uefi-x86). Four new desktop environment targets are added: desktop-stable-ubuntu-kde-plasma-uefi, desktop-stable-ubuntu-mate-uefi, desktop-stable-ubuntu-xfce-uefi, and desktop-stable-ubuntu-i3-wm-uefi. Each desktop target includes desktop environment configuration settings and consistent UEFI build items with extension configurations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main changes: adding UEFI desktop variants and plain cloud kernel entries to the release targets configuration.
Description check	✅ Passed	The description is directly related to the changeset, providing clear context about the additions, rationale, and test plan for the new UEFI desktops and cloud entries.
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 release-targets-add-uefi-desktops

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