secex: switch to pvimg in butane for fake secure VM

[nikita-dubrovskii]

el9,el10 and rhel-9.6 now ship s390utils-base >= 2.36.0, so switch from the obsolete genprotimg tool to pvimg. This change doesn't affect official qemu-secex builds, but only local dev builds.

Summary by CodeRabbit

• Bug Fixes
  • Updated secure boot image generation to use the current image creation tool.
  • Preserved existing inputs and output behavior while adding explicit image creation options.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Enterprise

Run ID: 6a935256-723a-4aea-83d1-f2832febdff4

📥 Commits

Reviewing files that changed from the base of the PR and between cbcb7c7 and 591e55d.

📒 Files selected for processing (1)

• src/secex-genprotimgvm-scripts/genprotimg.bu

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📝 Walkthrough

Walkthrough

The inline do_genprotimg script now invokes pvimg create instead of genprotimg to generate se.img, using the same image inputs and output path.

Changes

Image generation

Layer / File(s)	Summary
pvimg image creation src/secex-genprotimgvm-scripts/genprotimg.bu	The inline script replaces the genprotimg invocation with pvimg create, retaining the vmlinuz, initrd.img, parmfile, hostkey, and se.img inputs and output while adding the new command options.

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

🚥 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 clearly matches the main change: replacing genprotimg with pvimg in the Butane config for the fake secure VM.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Rolv-Apneseth]

LGTM

[c4rt0]

/lgtm