Generate version.ipxe

Generates version.ipxe for upstream notificaiton for clients

script/netbootxyz-overrides.yml

@@ -3,6 +3,7 @@ sigs_menu: true
 sigs_enabled: true
 img_sigs_enabled: false
 generate_disks_arm: true
+generate_version_file: true
 bootloader_multiple: true
 bootloader_disks:
   - "netboot.xyz"