My system configuration via Nix flakes

Fix topgrade by spawning with `nix-shell --run`

Packages installed with cargo were failing as the relevant system libraries were not available.

Created by  finchie  on March 18, 2024
PU57TJQJDNINFVVGHR4GJTUTJK6QPNMYF7I232VB2BB5YRQCW4AQC
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