fixup! scripts: fix shellcheck error and warnings

scripts/cleanup-db.sh

@@ -77,6 +77,6 @@ docker exec "$OSRD_POSTGRES" psql -p "$OSRD_POSTGRES_PORT" -f //tmp/init.sql > /
 echo "Deleting valkey cache..."
 docker exec "$OSRD_VALKEY" valkey-cli -p "$OSRD_VALKEY_PORT" FLUSHALL > /dev/null 2>&1 || docker volume rm -f $OSRD_VALKEY_VOLUME > /dev/null
 
-printf 'Cleanup done!\n'
+echo 'Cleanup done!'
 echo "You may want to apply migrations if you don't load a backup:"
 echo "'diesel migration run --migration-dir \"$root_path/editoast/migrations\"'  # 'docker compose up editoast' does it automatically"