For NixOS on AWS EC2, how to get IP address

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Maybe you can use the virtualisation.oci-containers.containers.<name>.environmentFiles option for that. At boot (or in a systemd timer if your ip address changes a lot, or even better, whenever you detect that it changes) run a script that writes your ip address to some file, e.g. /my-ip, and then set environmentFiles = ["/my-ip"]; in your container configuration.

You should instead define the itstarsun/frida-nix input in your flake.nix and then pass it into default.nix to make this pure, for example:

# flake.nix
{
  description = "NixOS module which provides NVIDIA vGPU functionality";

  inputs.frida.url = "github:itstarsun/frida-nix";

  outputs = { self, frida }: {
    nixosModules.nvidia-vgpu = import ./default.nix frida;
  };
}

# default.nix
fridaFlake: { pkgs, lib, config, buildPythonPackage, ... }:

let
  frida = fridaFlake.packages.${pkgs.system}.frida-tools;
# ...rest of your `default.nix`
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