Fix the sync command

apt-publisher/Makefile

 	docker pull rayburgemeestre/apt-ubuntu:16.04
 	docker run -t -v $$PWD:$$PWD -v $$PWD/gnupg:/root/.gnupg -v $$PWD/repo:/repo --workdir $$PWD rayburgemeestre/apt-ubuntu:16.04 /bin/sh -c "bash update.sh"
 	tar -czf repo.tar.gz repo
-	$$SYNC_CMD
+	rsync -raPv -e "$$SYNC_CMD_SSH" repo $$SYNC_CMD_DEST
 
 shell:
 	docker run -t -v $$PWD:$$PWD -v $$PWD/gnupg:/root/.gnupg -v $$PWD/repo:/repo --workdir $$PWD rayburgemeestre/apt-ubuntu:16.04 /bin/bash