Fix unbound WHITE in Alpine mixed-repo prompt

[Narehood]

Summary

Fixes alpineUpgrade.sh: line 772: WHITE: unbound variable when the mixed-repo update-anyway prompt is shown under set -u.

Cause

The options banner used ${WHITE} but that color variable was never defined.

Fix

Define WHITE alongside the other ANSI colors and guard it in the Alpine upgrade smoke test.

  

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 54793ba1-0c25-4ca7-b4b1-945b2b60e029

📥 Commits

Reviewing files that changed from the base of the PR and between 0fe10fe and dc5b9f7.

📒 Files selected for processing (3)

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

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