Initialize for Darwin system:
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
sh <(curl -L https://nixos.org/nix/install)
git clone https://github.com/sxyazi/dotfiles.git ~/.config
ln -s ~/.config/zsh/.zshenv ~/.zshenv
cd ~/.config/nix
nix build .#darwinConfigurations.ikas-Virtual-Machine.system
./result/sw/bin/darwin-rebuild switch --flake .gc
sudo nix-collect-garbage -d
nix-store --gc