chore: install nix

Author: samrose

.github/workflows/nix-build.yml

@@ -65,6 +65,9 @@ jobs:
       - name: Build psql bundle on macos
         if: matrix.runner == 'macos-latest'
         run: |
+          curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install --no-confirm \
+          --extra-conf "substituters = https://cache.nixos.org https://nix-postgres-artifacts.s3.amazonaws.com" \
+          --extra-conf "trusted-public-keys = nix-postgres-artifacts:dGZlQOvKcNEjvT7QEAJbcV6b6uk7VF/hWMjhYleiaLI=% cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
           cp ./docker/nix/build_nix.sh ./build_nix.sh
           sed -i '' 's/cd workspace//g' ./build_nix.sh
           sed -i '' '1s|^#!/bin/env bash|#!/usr/bin/env bash|' ./build_nix.sh