How to enable "Predictable Network Interface Names" in initrd?

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The solution is to add extra initrd udev rules:

nix-build --out-link /tmp/vm - <<'EOF'
(import <nixpkgs/nixos> {
  configuration = { lib, pkgs, ... }: with lib; {
    boot.initrd = {
      extraUdevRulesCommands = ''
        cp -v ${pkgs.systemd}/lib/udev/rules.d/75-net-description.rules $out
        cp -v ${pkgs.path}/nixos/modules/services/hardware/80-net-setup-link.rules $out
      '';
      preLVMCommands = ''
        echo
        echo "Yeah, predictable names:"
        ls -l /sys/class/net
        # Pause stage 1
        read
      '';
    };
  };
}).vm
EOF

# Run VM attached to console. To quit, press (Ctrl + A), c, q, <enter>
NIX_DISK_IMAGE=/tmp/vmimg /tmp/vm/bin/run-*-vm -m 1024 -smp 2 -nographic -append 'console=ttyS0'
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