Change image name if booting from sata

src/freedombone-image

     IMAGE_NAME=$'onion'
 fi
 
+if [ "$EXTERNAL_DRIVE" ]; then
+    IMAGE_NAME=$'sata'
+fi
+
 if [[ $VARIANT == 'mesh' ]]; then
     IMAGE_NAME=$'mesh'
     # typically not much disk space is needed for a mesh node