Here's a configuration that should just work:

{
  device = "instantnoodlep";
  flavor = "lineageos";
  androidVersion = 13;
  variant = "user";
  buildDateTime = 1732404420;

  signing = {
    enable = true;
    keyStorePath = "/FULL/PATH/TO/YOUR/KEYS/instantnoodlep";
  };

  apps = {
    chromium.enable = false;
    fdroid.enable = true;
    updater = {
      enable = true;
      url = "https://android.YOURDOMAIN.fi/instantnoodlep";
    };
  };

  webview.chromium = {
    enable = false;
    availableByDefault = false;
  };
}

this my current config on flake:

{
  description = "Robotnix configuration for OnePlus 8 Pro";

  inputs.robotnix.url = "github:danielfullmer/robotnix";

  outputs = { self, robotnix }: {
    robotnixConfigurations."oneplus8pro" = robotnix.lib.robotnixSystem ({ config, pkgs, ... }: {
      # Required options
      device = "instantnoodlep";  # Codename for OnePlus 8 Pro
      flavor = "lineageos";  # Change this to 'lineageos' if you want LineageOS, otherwise keep 'grapheneos' if supported
      androidVersion = 13;
      webview.chromium.enable = false;
      webview.prebuilt.enable = false;
      apps.chromium.enable = false;
    });

    # Default package for building the image
    defaultPackage.x86_64-linux = self.robotnixConfigurations."oneplus8pro".img;
  };
}

do i need signing and updater from the get go?