[2.3-maintenance] libutil: add ZstdDecompressionSink #9221
Merged
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Motivation
Nix 2.3 lacking zstd support has been an impediment to proposals to use zstd for cache.nixos.org. zstd decompression support suffices to remove this roadblock, and makes Nix 2.3 usable with existing caches using zstd.