Treat shelves as containers in pipes - #1376

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-java@v4, actions/upload-artifact@v4, gradle/actions/setup-gradle@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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Failed to restore gradle-home-v1|Windows|build[d9280098418c010299c742466acd0de9]-06b6797aad6bfde510eec3c12328c3c3aa65d493: Error: Cache service responded with 400