Allow Alpine upgrades with tagged edge overlays

[Narehood]

Summary

Fixes Alpine Release Upgrade aborting on common stable hosts that use tagged edge overlays (for example @testing .../edge/testing) alongside v3.23 main/community.

Change

• Treat a single versioned vX.Y branch plus tagged @testing/@edge lines as versioned (upgrade rewrites only the vX.Y URLs; tagged edge lines stay put)
• Still fail on true mixed channels (untagged edge with stable, latest-stable mixed with versioned, multiple vX.Y branches), with clearer reason lines
• Warn when tagged edge overlays are present

Reproduce / verify

Previously failed with:

Repository style: mixed
Repository branch: v3.23
[ERROR] Mixed repository channels detected

After this change, a file like:

.../alpine/v3.23/main
.../alpine/v3.23/community
@testing .../alpine/edge/testing

classifies as versioned and can proceed with the 3.23 → 3.24 upgrade.

  

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📥 Commits

Reviewing files that changed from the base of the PR and between 3c4fcc2 and 1a74581.

📒 Files selected for processing (3)

• Installers/.checksums.sha256
• Installers/alpineUpgrade.sh
• tests/alpine-upgrade.sh

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