Extensions-List: document the image-output-iso extension

[igorpecovnik]

Adds a reference entry for the image-output-iso extension (was uefi-iso) to Developer-Guide_Extensions-List.md, placed in the image-output-* family alongside qcow2/vhdx/ovf/etc.

image-output-iso builds a bootable live .iso from a UEFI image for BMC/IPMI virtual CD-ROM boot — boot the live system, then install to disk with armbian-install. Covers supported arches (amd64/arm64; riscv64 experimental), the grub dependency, the UEFI-only / Secure-Boot-off requirements, and the parameters.

Companion to armbian/build#10314.

Documentation website preview will be available shortly:

 Open WWW preview 

[coderabbitai]

Walkthrough

Added a Developer Guide entry for the image-output-iso extension. The entry documents live ISO creation, supported architectures, the grub prerequisite, Secure Boot and legacy BIOS limitations, default .img handling, and configuration parameters.

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

🚥 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.
Title check	✅ Passed	The title clearly identifies the documentation update for the image-output-iso extension.
Description check	✅ Passed	The description accurately explains the documented extension, its use case, requirements, architectures, and parameters.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-uefi-iso-extension-docs

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[iav]

The text is stronger than the PR in one place, and silent about one way to end up without an image.

"Works on amd64 and arm64 UEFI targets" — armbian/build#10314 marks arm64 as "arch-aware code in place, not yet tested on hardware". On top of that, the chroot used for grub-mkstandalone there runs after the static qemu has been removed from ${MOUNT}, so a cross-built arm64 image may not get that far. Worth saying the same thing the PR says: the code is there, untested on hardware.

The extension gates on [[ "${BOARD}" != uefi* ]], i.e. on the board name rather than the family. qemu-uefi-x86 (BOARDFAMILY=uefi-x86, config/boards/qemu-uefi-x86.csc:16) does not match and gets "disabled: only supported on UEFI boards". If the gate stays as is, listing "uefi-x86 / uefi-arm64" is accurate, but it is worth noting that qemu-uefi-x86 is not one of them.

UEFI_ISO_VOLID's default is given; UEFI_ISO_COMP (zstd) and UEFI_ISO_TIMEOUT (1) have none.

Also: since the .img is dropped by default, worth warning that CARD_DEVICE then silently writes nothing (details in my review on #10314). If that gets fixed there, the line is unnecessary.