iVentoy: stop early in an unprivileged container (#18179)

install/iventoy-install.sh

@@ -13,6 +13,12 @@ setting_up_container
 network_check
 update_os
 
+if [[ "${CTTYPE:-1}" != "0" ]]; then
+  msg_error "iVentoy requires a privileged LXC container."
+  msg_error "Recreate the container with unprivileged=0."
+  exit 10
+fi
+
 fetch_and_deploy_gh_release "iventoy" "ventoy/PXE" "prebuild" "latest" "/opt/iventoy" "iventoy-*-linux-$(arch_resolve x86_64-free arm64-trial).tar.gz"
 mkdir -p /opt/iventoy/{data,iso}