Cloud QCOW2 images are as small as they can be, but filesystem could / should be larger for start

This adds fixed +16Gb of resize, which doesn't make image any bigger, but when importing this as is, it might be better to not start without any free space. Now its 16Gb - cca. 600Mb.

config/sources/families/include/uefi_common.inc

@@ -26,6 +26,7 @@ case "${BRANCH}" in
 		declare -g INSTALL_ARMBIAN_FIRMWARE="no"
 		declare -g EXTRAWIFI="no"
 		declare -g UEFI_GRUB_TIMEOUT=0
+		declare -g QCOW2_RESIZE_AMOUNT="16G"
 		;;
 
 	legacy)