Add enable_droplet_caching property to gate rep's droplet cache - #1193
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Lets operators disable rep's local-disk caching of app droplet downloads, avoiding ephemeral-disk-full incidents on densely-packed cells at the cost of re-downloading droplets from the blobstore on every restart/scale. Buildpack/lifecycle bundle caching is unaffected. Defaults to true (current behavior unchanged) via the BOSH job spec. ai-assisted=yes TNZ-126780
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Keeps jobs/rep_windows in sync with jobs/rep: Task 3 added the diego.executor.enable_droplet_caching property to jobs/rep but missed the Windows job, which shares the same executor config. tnz-runtime- containers-release already had rep_windows parity from Task 8b. ai-assisted=yes TNZ-126780 Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
The cached downloader will not evict cached files marked as "in use". As a result, on densely packed cells, the download cache will grow and grow beyond the max cache directory size, as all the cached droplet files are actually in use.
For these cases, this change lets operators disable rep's local-disk caching of app droplet downloads, avoiding ephemeral-disk-full incidents on densely-packed cells at the cost of re-downloading droplets from the blobstore on every restart/scale. Buildpack/lifecycle bundle caching is unaffected. Defaults to true (current behavior unchanged) via the BOSH job spec.
ai-assisted=yes
TNZ-126780
Backward Compatibility
Breaking Change? yes