fix test for dns zone

manifests/psc/setting-psc.sh

@@ -30,7 +30,7 @@ fi
 gcloud dns managed-zones describe $GCP_DNS_ZONE_MAGENTO_ELASTIC > /dev/null 2>&1
 DNS_ZONE_CREATED=$?
 
-if [[ $DNS_ZONE_CREATED -ne 0 ]]; then
+if [[ $DNS_ZONE_CREATED == 0 ]]; then
   echo 'DNS_ZONE_CREATED'
 else
   gcloud dns managed-zones create $GCP_DNS_ZONE_MAGENTO_ELASTIC --description="Managed by GitLab CI" --dns-name=$ELASTIC_DNS_ZONE. --visibility=private --networks=$GCP_NETWORK_NAME