Tech evaluation: Optimize zip serving by caching archive files

We need to investigate if we need to cache the zip archives in memory and perhaps find a better mechanism than the one used in #377 (closed) as a PoC (related MR !299 (comment 377210612))

This might or not be needed, we should keep an eye on zip serving metrics once that's rolled out #423 (closed) and see if we need to optimize zip serving.