FIX (dockerfile): Fix database creation SQL script

Author: RostislavDugin

Dockerfile

@@ -167,7 +167,8 @@ echo "Setting up database and user..."
 gosu postgres \$PG_BIN/psql -p 5437 -h localhost -d postgres << 'SQL'
 ALTER USER postgres WITH PASSWORD 'Q1234567';
 SELECT 'CREATE DATABASE postgresus OWNER postgres'
-WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'postgresus')\gexec
+WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'postgresus')
+\gexec
 \q
 SQL