fixing iso issue

hosts/acheron/iso.nix

@@ -1,17 +1,14 @@
 # ── acheron rescue / installer ISO ─────────────────────────────
-{
-  config,
-  pkgs,
-  pkgs-unstable,
-  lib,
-  ...
-}: {
+# ISO for VM / server deployment. Supports both BIOS (SeaBIOS) and
+# UEFI boot for maximum Proxmox compatibility.
+{ config, pkgs, pkgs-unstable, lib, ... }: {
   imports = [
     ../iso/default.nix
   ];
 
-  boot.loader.grub.enable = lib.mkDefault true;
-  boot.loader.grub.devices = ["nodev"];
+  # Support both BIOS and UEFI boot
+  isoImage.makeBiosBootable = true;
+  isoImage.makeEfiBootable = true;
 
   iso.extraPackages = with pkgs; [btrfs-progs];
   iso.diskoConfig = ./disko-config.nix;

hosts/armaros/iso.nix

@@ -1,17 +1,14 @@
 # ── armaros rescue / installer ISO ─────────────────────────────
-{
-  config,
-  pkgs,
-  pkgs-unstable,
-  lib,
-  ...
-}: {
+# ISO for VM / server deployment. Supports both BIOS (SeaBIOS) and
+# UEFI boot for maximum Proxmox compatibility.
+{ config, pkgs, pkgs-unstable, lib, ... }: {
   imports = [
     ../iso/default.nix
   ];
 
-  boot.loader.grub.enable = lib.mkDefault true;
-  boot.loader.grub.devices = ["nodev"];
+  # Support both BIOS and UEFI boot
+  isoImage.makeBiosBootable = true;
+  isoImage.makeEfiBootable = true;
 
   iso.extraPackages = with pkgs; [btrfs-progs];
   iso.diskoConfig = ./disko-config.nix;

hosts/buildbox/iso.nix

@@ -1,23 +1,14 @@
 # ── buildbox rescue / installer ISO ────────────────────────────
-{
-  config,
-  pkgs,
-  pkgs-unstable,
-  lib,
-  ...
-}: {
+# ISO for VM deployment. Supports both BIOS (SeaBIOS) and
+# UEFI boot for maximum Proxmox compatibility.
+{ config, pkgs, pkgs-unstable, lib, ... }: {
   imports = [
     ../iso/default.nix
   ];
 
-  # Enable BIOS (MBR) boot for SeaBIOS compatibility in Proxmox
-  boot.loader.grub.enable = lib.mkDefault true;
-  boot.loader.grub.devices = ["nodev"];
-  boot.loader.grub.efiSupport = false;
-
-  # Build ISO with both BIOS and UEFI support
-  isoImage.makeEfiBootable = true;
+  # Support both BIOS and UEFI boot
   isoImage.makeBiosBootable = true;
+  isoImage.makeEfiBootable = true;
 
   iso.extraPackages = with pkgs; [btrfs-progs];
   iso.diskoConfig = ./disko-config.nix;

hosts/eva-01/iso.nix

@@ -1,18 +1,14 @@
 # ── eva-01 rescue / installer ISO ──────────────────────────────
-{
-  config,
-  pkgs,
-  pkgs-unstable,
-  lib,
-  ...
-}: {
+# ISO for deploying on physical hardware (ThinkPad X1 Nano).
+# Supports both BIOS and UEFI boot.
+{ config, pkgs, pkgs-unstable, lib, ... }: {
   imports = [
     ../iso/default.nix
   ];
 
-  # Boot — EFI + legacy BIOS for broad hardware compatibility
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
+  # Support both BIOS and UEFI boot
+  isoImage.makeBiosBootable = true;
+  isoImage.makeEfiBootable = true;
 
   # Extra tools for Btrfs rescue
   iso.extraPackages = with pkgs; [

hosts/eva-03/iso.nix

@@ -1,17 +1,14 @@
 # ── eva-03 rescue / installer ISO ──────────────────────────────
-{
-  config,
-  pkgs,
-  pkgs-unstable,
-  lib,
-  ...
-}: {
+# ISO for deploying on physical hardware.
+# Supports both BIOS and UEFI boot.
+{ config, pkgs, pkgs-unstable, lib, ... }: {
   imports = [
     ../iso/default.nix
   ];
 
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
+  # Support both BIOS and UEFI boot
+  isoImage.makeBiosBootable = true;
+  isoImage.makeEfiBootable = true;
 
   iso.diskoConfig = ./disko-config.nix;
   iso.description = "eva-03 Rescue ISO";

hosts/iso/default.nix

@@ -18,6 +18,11 @@
 }: let
   cfg = config.iso;
 in {
+  # Disable disko config application on ISOs — we only want the disko CLI tool.
+  # Without this, disko would try to apply filesystems/boot config at build time,
+  # which conflicts with ISO-specific overrides and can cause boot failures.
+  disko.enableConfig = false;
+
   options.iso = {
     diskoConfig = lib.mkOption {
       type = lib.types.path;