simplex-chat/scripts/nix

Updating nix package config

1. Install nix, gawk and jq.

2. Start nix-shell from repo root:

nix-shell -p nix-prefetch-git

3. Run in nix shell:

gawk -f ./scripts/nix/update-sha256.awk cabal.project > ./scripts/nix/sha256map.nix