chore!: prepare for multi-host config

flake.nix

@@ -10,10 +10,23 @@
   outputs =
     { nixpkgs, home-manager, ... }:
     {
-      nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
+      nixosConfigurations.selune = nixpkgs.lib.nixosSystem {
         system = "x86_64-linux";
         modules = [
-          ./nixos/configuration.nix
+          ./hosts/selune/configuration.nix
+          home-manager.nixosModules.home-manager
+          {
+            home-manager.useGlobalPkgs = true;
+            home-manager.useUserPackages = true;
+            home-manager.users.hms = ./home/home.nix;
+            home-manager.backupFileExtension = "bak";
+          }
+        ];
+      };
+      nixosConfigurations.shar = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        modules = [
+          ./hosts/shar/configuration.nix
           home-manager.nixosModules.home-manager
           {
             home-manager.useGlobalPkgs = true;

hosts/selune/configuration.nix

@@ -5,6 +5,16 @@
   # Use flakes.
   nix.settings.experimental-features = "nix-command flakes";
 
+  # Automatic updating.
+  system.autoUpgrade.enable = true;
+  system.autoUpgrade.dates = "weekly";
+
+  # Automatic cleanup.
+  nix.gc.automatic = true;
+  nix.gc.dates = "daily";
+  nix.gc.options = "--delete-older-than 10d";
+  nix.settings.auto-optimise-store = true;
+
   # Bootloader.
   boot.loader = {
     systemd-boot.enable = true;