reproducible: fix perms

hosts/jenkins/etc/pbuilder/rebuild-hooks/D01_modify_environment

@@ -17,6 +17,7 @@ if [ -x /usr/bin/disorderfs ] ; then
 	mknod -m 666 /dev/fuse c 10 229
 	mv /tmp/buildd /tmp/disorderfs
 	mkdir /tmp/buildd
+	chown pbuilder2 /tmp/buildd
 	su pbuilder2 -c 'disorderfs /tmp/disorderfs /tmp/buildd'
 else
 	echo "Warning: disorderfs not available."