mauville/home: build select flake nixosConfigurations daily

hosts/mauville/home.nix

@@ -66,7 +66,8 @@
     users.aly = {
       imports = [../../homes/aly.nix];
       systemd.user = {
-        services.backblaze-sync = {
+        services = {
+          backblaze-sync = {
             Unit = {
               Description = "Backup to Backblaze.";
             };
@@ -92,7 +93,30 @@
               ''}";
             };
           };
-        timers.backblaze-sync = {
+
+          build-hosts = {
+            Unit = {
+              Description = "Build nixosConfiguration for each host.";
+            };
+            Service = {
+              ExecStart = "${pkgs.writeShellScript "build-hosts" ''
+                hosts=(
+                  fallarbor
+                  lavaridge
+                  petalburg
+                  rustboro
+                )
+
+                for h in "''${hosts[@]}"; do
+                  nix build github:alyraffauf/nixcfg#nixosConfigurations.$h.config.system.build.toplevel
+                done
+              ''}";
+            };
+          };
+        };
+
+        timers = {
+          backblaze-sync = {
             Unit = {
               Description = "Daily backups to Backblaze.";
             };
@@ -103,6 +127,18 @@
               OnCalendar = "*-*-* 03:00:00";
             };
           };
+          build-hosts = {
+            Unit = {
+              Description = "Build hosts daily.";
+            };
+            Install = {
+              WantedBy = ["timers.target"];
+            };
+            Timer = {
+              OnCalendar = "*-*-* 06:00:00";
+            };
+          };
+        };
       };
     };
     users.dustin = import ../../homes/dustin.nix;