Add initial legacy configuration

nixos-configurations/speer/filesystems.nix

@@ -0,0 +1,22 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+{
+  # Configurations are set in disko-config.nix!
+
+  # mdadm.conf generated by `mdadm --detail --scan`
+  # TODO
+  boot.swraid.enable = true;
+  boot.swraid.mdadmConf = ''
+    MAILADDR root
+  '';
+
+  services.fwupd.daemonSettings.EspLocation = pkgs.lib.mkForce config.disko.devices.disk.system-1.content.partitions.boot.content.mountpoint;
+
+  # Use the systemd-boot EFI boot loader.
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+}