Using DeterminateSystems/nix-installer-action@e50d5f73bfe71c2dd0aa4218de8f4afa59f8f81d (which is v16, the latest tag as of today).

Warning: Failed to restore: Cache service responded with 422

and

Failed to save: Unable to reserve cache with key determinatesystem-nix-installer-x86_64-linux-c08c41b9962aa670d628df58a1ee5cd7-9, another job may be creating this cache. More details: This legacy service is shutting down, effective April 15, 2025. Migrate to the new service ASAP. For more information: https://gh.io/gha-cache-sunset