Create tsearch_extras in production database setup

(imported from commit e6c699b06f022d923b57ccee7ad778f870bf890d)

scripts/setup/postgres-init-db

@@ -1,4 +1,4 @@
-#/bin/sh -xe
+#!/bin/sh -xe
 
 su postgres -c psql <<EOF
 CREATE USER zulip;
@@ -7,5 +7,10 @@ DROP DATABASE IF EXISTS zulip;
 CREATE DATABASE zulip OWNER=zulip;
 EOF
 
+su postgres -c psql zulip <<EOF
+CREATE SCHEMA zulip OWNER=zulip;
+CREATE EXTENSION tsearch_extras SCHEMA zulip;
+EOF
+
 echo "Database created"