feat: switch to automatic nixosConfiguration population

flake.nix

@@ -4,14 +4,10 @@
     nixos-hardware.url = "github:NixOS/nixos-hardware/master";
   };
 
-  outputs = inputs @ { self, nixpkgs, ... }: {
-    nixosConfigurations.backstage = nixpkgs.lib.nixosSystem {
-      system = "x86_64-linux";
-      modules = [
-        ./hosts/backstage
-      ];
-      specialArgs = { inherit inputs; };
-    };
+  outputs = inputs @ { self, nixpkgs, ... }:  {
+    imports = [
+      ./hosts
+    ];
   };
 }
 

hosts/default.nix

@@ -0,0 +1,21 @@
+{inputs, self, ...}:
+let
+  inherit (inputs.nixpkgs) lib;
+  isDirectory = _name: type: type == "directory";
+  hostNames = builtins.attrNames (
+    lib.filterAttrs isDirectory (builtins.readDir ./.)
+  );
+  hosts = lib.genAttrs hostNames (name: {
+    imports = [
+      (./. + "/${name}")
+    ];
+  });
+in 
+{
+
+  nixosConfigurations = lib.map (host: lib.nixosSystem {
+    system = "x86_64-linux";
+    modules = host;
+    specialArgs = { inherit inputs; };
+  }) (builtins.attrValues hosts);
+}