nixos/release{,-combined}: drop the VirtualBox OVA (#352603)

nixos/doc/manual/installation/installing-virtualbox-guest.section.md

@@ -1,10 +1,8 @@
 # Installing in a VirtualBox guest {#sec-installing-virtualbox-guest}
 
 Installing NixOS into a VirtualBox guest is convenient for users who
-want to try NixOS without installing it on bare metal. If you want to
-use a pre-made VirtualBox appliance, it is available at [the downloads
-page](https://nixos.org/download/#nixos-virtualbox). If you want to set
-up a VirtualBox guest manually, follow these instructions:
+want to try NixOS without installing it on bare metal. If you want to set
+up a VirtualBox guest, follow these instructions:
 
 1.  Add a New Machine in VirtualBox with OS Type "Linux / Other Linux"
 

nixos/release-combined.nix

@@ -53,7 +53,6 @@ in rec {
         (onFullSupported "nixos.iso_plasma6")
         (onFullSupported "nixos.iso_gnome")
         (onFullSupported "nixos.manual")
-        (onSystems ["x86_64-linux"] "nixos.ova")
         (onSystems ["aarch64-linux"] "nixos.sd_image")
         (onFullSupported "nixos.tests.acme")
         (onSystems ["x86_64-linux"] "nixos.tests.boot.biosCdrom")

nixos/release.nix

@@ -230,21 +230,6 @@ in rec {
     inherit system;
   });
 
-  # A bootable VirtualBox virtual appliance as an OVA file (i.e. packaged OVF).
-  ova = forMatchingSystems [ "x86_64-linux" ] (system:
-
-    with import ./.. { inherit system; };
-
-    hydraJob ((import lib/eval-config.nix {
-      inherit system;
-      modules =
-        [ versionModule
-          ./modules/installer/virtualbox-demo.nix
-        ];
-    }).config.system.build.virtualBoxOVA)
-
-  );
-
   # KVM image for proxmox in VMA format
   proxmoxImage = forMatchingSystems [ "x86_64-linux" ] (system:
     with import ./.. { inherit system; };