flake.nix: Support different system types

lib/flake-helper.nix

@@ -1,10 +1,13 @@
 { self, nixpkgs, nixos-exporter, solid-xmpp-alarm, ... }@inputs:
 
 rec {
-  generateNixosSystem = name: let
+  generateNixosSystem = {
+    name,
+    system ? "x86_64-linux",
+  }: let
     localNixpkgs = nixpkgs.lib.attrByPath [ "nixpkgs-${name}" ] nixpkgs inputs;
   in localNixpkgs.lib.nixosSystem {
-    system = "x86_64-linux";
+    system = system;
     modules = [
       ({ ... }: {
         /*
@@ -28,6 +31,8 @@ rec {
     ];
   };
 
+  mapToNixosConfigurations = hosts: builtins.mapAttrs (name: host: generateNixosSystem host) hosts;
+
   generateColmenaHost = name: hostSystem: {
     deployment = {
       targetHost = "${name}.net.clerie.de";