clan flash: Remove root requirement for flash, add a flash-template

templates/machineTemplates/machines/flash-installer/configuration.nix

@@ -1,7 +1,18 @@
+{
+  config,
+  clan-core,
+  inputs,
+  ...
+}:
 {
   imports = [
-
+    ./disko.nix
+    clan-core.nixosModules.installer
+    clan-core.clanModules.trusted-nix-caches
+    clan-core.clanModules.disk-id
+    clan-core.clanModules.iwd
   ];
 
-  # Flash machine template
+  nixpkgs.pkgs = inputs.nixpkgs.legacyPackages.x86_64-linux;
+  system.stateVersion = config.system.nixos.version;
 }

templates/machineTemplates/machines/flash-installer/disko.nix

@@ -0,0 +1,54 @@
+{ config, lib, ... }:
+
+let
+  suffix = config.clan.core.vars.generators.disk-id.files.diskId.value;
+in
+{
+  boot.loader.grub.efiSupport = lib.mkDefault true;
+  boot.loader.grub.efiInstallAsRemovable = lib.mkDefault true;
+  disko.devices = {
+    disk = {
+      "main" = {
+        name = "main-" + suffix;
+        type = "disk";
+        device = lib.mkDefault "/dev/null";
+        content = {
+          type = "gpt";
+          partitions = {
+            "boot" = {
+              size = "1M";
+              type = "EF02"; # for grub MBR
+              priority = 1;
+            };
+            "ESP" = {
+              size = "512M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            root = {
+              name = "root";
+              end = "-0";
+              content = {
+                type = "filesystem";
+                format = "f2fs";
+                mountpoint = "/";
+                extraArgs = [
+                  "-O"
+                  "extra_attr,inode_checksum,sb_checksum,compression"
+                ];
+                # Recommendations for flash: https://wiki.archlinux.org/title/F2FS#Recommended_mount_options
+                mountOptions = [
+                  "compress_algorithm=zstd:6,compress_chksum,atgc,gc_merge,lazytime,nodiscard"
+                ];
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}