Supplemented definition of helper script due to changed interface of...

Supplemented definition of helper script due to changed interface of `hive.wait_for_ready_instance` function.

scripts/ci/wait-for-postgres.sh

@@ -9,7 +9,7 @@ DATABASE_URL=$1
 wait_for_postgres() {
   echo "Waiting for postgres hosted by container at the URL: ${DATABASE_URL}."
 
-  timeout $LIMIT bash -c "until psql \"${DATABASE_URL}\" -c \"SELECT hive.wait_for_ready_instance('4 MIN'::interval);\" ; do sleep 3 ; done"
+  timeout $LIMIT bash -c "until psql \"${DATABASE_URL}\" -c \"SELECT hive.wait_for_ready_instance(ARRAY['hivemind_app'], '4 MIN'::interval);\" ; do sleep 3 ; done"
 
 }