Added '--format=directory' for 'mmdebstrap'

partition.sh

@@ -437,6 +437,7 @@ elif [[ "${ID}" == 'debian' ]]; then
 		--skip=check/empty \
 		--components=main,non-free-firmware,contrib \
 		--mode=root \
+		--format=directory \
 		--include=console-setup \
 		--include=cryptsetup \
 		--include=curl \