Use bitnamilegacy org for PostgreSQL container

Author: mosabua

tests/gateway/test.sh

@@ -96,6 +96,7 @@ DB_INSTALLATION_NAME=gateway-backend-db
 helm upgrade --install ${DB_INSTALLATION_NAME} oci://registry-1.docker.io/bitnamicharts/postgresql -n "$DB_NAMESPACE" \
     --create-namespace \
     --version "16.7.27" \
+    --set image.repository=bitnamilegacy/postgresql \
     --set common.resources.preset=micro \
     --set auth.username=gateway \
     --set auth.password=${DB_PASSWORD} \