jethome: fix jethub-burn extension: add BETA=yes support

[adeepn]

Description

Nightly image jobs for JetHub boards fail while converting the image to Amlogic burn format:

INFO: Converting image to Amlogic burn format [ jethub-burn :: jethubj80 ]
ERROR: u-boot deb not found for jethubj80
ERROR: Exiting with error 43
   post_build_image__900_jethub_burn() --> extensions/jethub-burn.sh:133

How Has This Been Tested?

• BETA=yes build ok

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings

Summary by CodeRabbit

• Bug Fixes
  • Improved package lookup for image creation so it now uses the preferred storage location when available, with a fallback to the build output directory.
  • This helps the burn-image process find the correct Debian package more reliably during builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between d8387c6 and 5debeb3.

📒 Files selected for processing (1)

• extensions/jethub-burn.sh

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📝 Walkthrough

Walkthrough

The debs_dir variable in post_build_image__900_jethub_burn within extensions/jethub-burn.sh now checks the DEB_STORAGE environment variable first, falling back to ${SRC}/output/debs if unset. Subsequent logic for deb discovery, extraction, and burn-image creation is unchanged.

Changes

Jethub Burn Deb Directory Resolution

Layer / File(s)	Summary
Deb directory fallback logic extensions/jethub-burn.sh	debs_dir now prefers DEB_STORAGE when set, falling back to ${SRC}/output/debs as before.

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

🚥 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
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is related to the change because the DEB_STORAGE lookup fix supports BETA=yes builds, even if it is more specific about the build mode than the code change itself.
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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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!