install stage 1: add an error check on installing base system

install-stage1.sh

@@ -253,6 +253,11 @@ XBPS_ARCH="$TARGET_TYPE" xbps-install --yes --sync --rootdir /mnt/target --repos
   diffutils pciutils usbutils tzdata base-files ncurses mdocml procps-ng \
   kbd xbps sudo ethtool kmod eudev runit-void removed-packages nano acpid \
   squashfs-tools grub grub-i386-efi grub-x86_64-efi dracut xz 2>&1 | tee --append $LOGFILE
+if [ "$?" -ne 0 ]; then
+  echo ""
+  echo "An error occurred while trying to install the base system."
+  exit 1
+fi
 echo ""
 
 echo "Adding mirror configuration."