Sd-image fails to boot due to timeout on /nix/store mounting unit

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1

I am trying to create a disk image that I can copy to an SD card and boot a Raspberry Pi 3 B+ from without having to install NixOS from an ISO and then switch to my configuration.

This is my config:

# configuration.nix
{ inputs, lib, modulesPath, pkgs, ... }:

{
  imports = [
    "${inputs.nixos-hardware.result}/raspberry-pi/3"

    ./hardware-configuration.nix
    # ./services
  ];

  networking = {
    interfaces.eth0.useDHCP = lib.mkDefault true;
    hostName = "rpi3-dns";
  };
  hardware.enableRedistributableFirmware = true;
  services.timesyncd.enable = lib.mkDefault true;

  systemd.services.sshd.wantedBy = lib.mkOverride 40 [ "multi-user.target" ];
  services.sshd.enable = true;

  # Removes ZFS from the kernel and makes builds faster.
  boot.supportedFilesystems = lib.mkForce [ "ext4" "vfat" ];

  services.fwupd.enable = false;
  services.udisks2.enable = false;
  programs.command-not-found.enable = false;
  boot.enableContainers = false;

  environment.systemPackages = with pkgs; [
    dig
  ];

  users = {
    mutableUsers = false;
    users.plumber = {
      description = "Maintenance account for remote access.";
      isNormalUser = true;

      hashedPassword = "!";
      extraGroups = [ "wheel" ];
      
      openssh.authorizedKeys.keys = [
        "<removed>"
      ];
    };
    users.root = {
      password = "root";
    };
  };
  networking.useNetworkd = true;

  time.timeZone = "utc";

  boot.tmp.cleanOnBoot = true;
  nix.gc.automatic = true;
  nix.gc.options = "--delete-older-than 30d";

  networking.firewall = {
    enable = true;

    allowedTCPPorts = [ 53 ];
    allowedUDPPorts = [ 53 ];
  };

  nixpkgs.buildPlatform = "aarch64-linux";
  system.stateVersion = "24.11";
}

# hardware-configuration.nix
{ config, lib, modulesPath, pkgs, ... }:

{
    imports = [
        (modulesPath + "/installer/scan/not-detected.nix")
    ];

    boot.initrd.availableKernelModules = [ "xhci_pci" "usbhid" ];
    boot.initrd.kernelModules = [];
    boot.kernelModules = [];
    boot.extraModulePackages = [ ];

    fileSystems."/" =
        { device = "/dev/disk/by-label/NIXOS_SD";
        fsType = "ext4";
        options = [ "noatime" ];
        };

    swapDevices = [ ];

    # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
    # (the default) this is the recommended approach. When using systemd-networkd it's
    # still possible to use this option, but it's recommended to use it in conjunction
    # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
    networking.useDHCP = lib.mkDefault true;
    # networking.interfaces.end0.useDHCP = lib.mkDefault true;
    # networking.interfaces.wlan0.useDHCP = lib.mkDefault true;

    nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
}

I use the command nix run nixpkgs#nixos-generators -- -f sd-aarch64 --flake .#rpi3-dns --system aarch64-linux -o ./pi.sdcard to generate the SD card image and copy it to a SD card using dd if=nixos.img of=/dev/sda bs=1m.

The log outputs that are not marked OK are:

[ TIME ] Timed out waiting for device /dev/disk/by-label/nix-store
[DEPEND] Dependency failed for /sysroot/nix/store
[DEPEND] Dependency failed for Initrd filesystem
[DEPEND] Dependency failed for Find NixOS Closure
...
 [ TIME ] Timed out waiting for device /dev/disk/by-label/nix-store
[DEPEND] Dependency failed for /sysroot/nix/store
[DEPEND] Dependency failed for Initrd filesystem
[FAILED] Failed to start NixOS Activation

I don’t see the issue in my config. I was hoping someone with more knowledge could help me out! Thank you for taking your time!