Add GitHub Actions workflow to clean up PR branch caches on close#931

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Copilot wants to merge 2 commits intomainfrom

copilot/add-cleanup-workflow-for-caches

Commits on Mar 16, 2026

Initial plan
Copilot
committed
Improve CleanupCaches workflow: use native gh cache commands, remove unnecessary checkout, add permissions block

Copilot
and
BenjaminMichaelis
committed