Factor out disable-suspend.nix from machines/mini

I'm going to share it.

Author: bjornfor

cfg/disable-suspend.nix

@@ -0,0 +1,8 @@
+{
+  # Disable the GNOME3/GDM auto-suspend feature that cannot be disabled in GUI!
+  # If no user is logged in, the machine will power down after 20 minutes.
+  systemd.targets.sleep.enable = false;
+  systemd.targets.suspend.enable = false;
+  systemd.targets.hibernate.enable = false;
+  systemd.targets.hybrid-sleep.enable = false;
+}

machines/mini/configuration.nix

@@ -19,6 +19,7 @@ in
     ../../cfg/base-big.nix
     ../../cfg/cgit.nix
     ../../cfg/clamav.nix
+    ../../cfg/disable-suspend.nix
     ../../cfg/gitolite.nix
     ../../cfg/git-daemon.nix
     ../../cfg/backup-server.nix
@@ -302,12 +303,6 @@ in
     };
   };
 
-  # Disable the GNOME3/GDM auto-suspend feature that cannot be disabled in GUI!
-  systemd.targets.sleep.enable = false;
-  systemd.targets.suspend.enable = false;
-  systemd.targets.hibernate.enable = false;
-  systemd.targets.hybrid-sleep.enable = false;
-
   systemd.services.archive-photos-from-syncthing = {
     description = "Archive photos from Syncthing";
     startAt = "weekly";