use --bind instead of -o bind

looks nicer

setup.sh

@@ -46,8 +46,8 @@ debootstrap --variant=minbase --arch=amd64 buster "$chroot" https://deb.debian.o
 
 mount -t proc none "$chroot/proc"
 mount -t sysfs none "$chroot/sys"
-mount -o bind /dev "$chroot/dev"
+mount --bind /dev "$chroot/dev"
-mount -o bind /run "$chroot/run"
+mount --bind /run "$chroot/run"
 
 
 # set hostname