generate-armbian-images-json: support UEFI cloud .iso artifacts

[igorpecovnik]

What

The UEFI cloud targets (uefi-arm64 / uefi-x86, BRANCH: cloud) now publish a live .iso (uncompressed) alongside qcow2/vhdx. This teaches the download-index generator (scripts/generate-armbian-images-json.sh) to represent it correctly.

Three small additions:

1. extract_file_extension — map a plain .iso to the canonical iso extension (before this it fell through to the generic last-token fallback).
2. strip_img_ext — strip a trailing .iso so parse_image_name recovers the clean variant token (minimal) instead of minimal.iso.
3. REDI variant — give ISOs a distinct -iso variant, mirroring qcow2's -qcow2, so the redirector URL comes out as:

https://dl.armbian.com/uefi-arm64/Noble_cloud_minimal-iso

The release-asset filter already lets .iso through (it only drops .txt/.asc/.sha/.torrent), so no change needed there.

Validation

Unit-tested the parsing/URL assembly:

filename	file_extension	redi_url
..._uefi-arm64_noble_cloud_..._minimal.iso	iso	.../uefi-arm64/Noble_cloud_minimal-iso

Regression-checked: .img.qcow2.xz → img.qcow2.xz and .img.xz → img.xz unchanged. bash -n clean.

Pairs with the build-side change that produces the ISO (image-output-iso) and the release-target additions that enable it for the trixie minimal UEFI cloud target.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 70730ed9-e0ea-4850-839b-6760822050e9

📥 Commits

Reviewing files that changed from the base of the PR and between 1302c4f and 07dcde6.

📒 Files selected for processing (1)

• scripts/generate-armbian-images-json.sh

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Walkthrough

The image metadata generator now strips .iso and compressed tar extensions. It classifies uncompressed ISO files as iso. REDI variant generation now adds the -iso suffix for ISO artifacts.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• armbian/armbian.github.io#375: Adds ISO outputs that this change recognizes during image metadata generation.
• armbian/armbian.github.io#380: Also modifies ISO artifact handling for image generation and release targets.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the script and its primary change: support for UEFI cloud ISO artifacts.
Description check	✅ Passed	The description directly explains the ISO parsing, variant handling, URL changes, and validation for the changeset.
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 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/images-json-iso-support

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