Fix CACHE_VERSION access in bash script context

[Copilot]

• Resolves: dont rebuild already built apps #127 (comment)

Summary

The CACHE_VERSION environment variable was inaccessible in the bash script that generates cache keys. GitHub Actions expressions like ${{ env.CACHE_VERSION }} are not evaluated inside run: blocks, causing malformed cache keys.

Changes:

• Pass CACHE_VERSION as environment variable to the "Collect apps and their SHAs" step
• Update bash script to reference $CACHE_VERSION instead of ${{ env.CACHE_VERSION }}

  - name: Collect apps and their SHAs for cache-based building
    id: detect
    env:
      GH_TOKEN: ${{ github.token }}
+     CACHE_VERSION: ${{ env.CACHE_VERSION }}
    run: |
      ...
-     CACHE_KEY="${{ env.CACHE_VERSION }}-app-build-${APP_NAME}-${CURRENT_SHA}"
+     CACHE_KEY="${CACHE_VERSION}-app-build-${APP_NAME}-${CURRENT_SHA}"

TODO

• Fix CACHE_VERSION access in bash context

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

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