Add custom installer iso

flake-parts/iso.nix

@@ -0,0 +1,61 @@
+{ inputs, self, ... }:
+{
+  perSystem =
+    { system, lib, ... }:
+    {
+      packages.iso =
+        (inputs.nixpkgs.lib.nixosSystem {
+          specialArgs = {
+            inherit inputs;
+            inherit (self) allHosts;
+          };
+
+          modules = lib.singleton (
+            {
+              config,
+              inputs,
+              pkgs,
+              allHosts,
+              ...
+            }:
+            {
+              nixpkgs.hostPlatform = system;
+
+              nix.settings.experimental-features = [ "pipe-operators" ];
+
+              networking = {
+                hostName = "installer";
+                wireless.enable = false;
+                networkmanager.enable = true;
+              };
+
+              console.keyMap = "de-latin1-nodeadkeys";
+
+              boot.supportedFilesystems = {
+                zfs = false;
+                bcachefs = true;
+              };
+
+              environment.systemPackages = [ inputs.disko.packages.${pkgs.stdenv.hostPlatform.system}.default ];
+
+              services.openssh = {
+                enable = true;
+                settings = {
+                  PasswordAuthentication = false;
+                  KbdInteractiveAuthentication = false;
+                };
+              };
+
+              users.users.root.openssh.authorizedKeys.keyFiles =
+                allHosts
+                |> lib.attrValues
+                |> lib.filter (host: host.config.networking.hostName != config.networking.hostName)
+                |> lib.filter (host: host.config |> lib.hasAttr "home-manager")
+                |> lib.map (host: host.config.home-manager.users.seb.custom.programs.ssh)
+                |> lib.filter (ssh: ssh.enable)
+                |> lib.map (ssh: ssh.publicKeyFile);
+            }
+          );
+        }).config.system.build.images.iso-installer;
+    };
+}