fix: disable networking for customization

Author: RoyalOughtness

action.yml

@@ -110,7 +110,10 @@ runs:
         sudo mv output/qcow2/disk.qcow2 /var/lib/libvirt/images/
         DISK_IMAGE_PATH="/var/lib/libvirt/images/disk.qcow2"
         PUBKEY_PATH="$HOME/.ssh/id_ed25519.pub"
-        export LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1
+        export LIBGUESTFS_BACKEND=direct
+        export LIBGUESTFS_NETWORK=0
+        export LIBGUESTFS_DEBUG=1
+        export LIBGUESTFS_TRACE=1
         sudo virt-customize -a "$DISK_IMAGE_PATH" \
           --run-command 'useradd -m -G wheel -s /bin/bash core' \
           --mkdir /home/core/.ssh \