Shopware 6.5 complains of missing LOCK_DSN variable on build command.

When I check out a production Shopware 6.5 project with composer like described in the documentation here: https://developer.shopware.com/docs/guides/installation/template.html
I get an error because there is no LOCK_DSN in the .env file.

modules/platform-prod/build.sh

@@ -45,7 +45,8 @@ SHOPWARE_ES_INDEXING_ENABLED=0
 SHOPWARE_ES_INDEX_PREFIX=test_
 COMPOSER_HOME=/tmp/composer-tmp-${SECRET}
 SHOPWARE_HTTP_CACHE_ENABLED=0
-SHOPWARE_HTTP_DEFAULT_TTL=7200" >.env
+SHOPWARE_HTTP_DEFAULT_TTL=7200
+LOCK_DSN=flock" >.env
 
 export PROJECT_ROOT=$SHOPWARE_FOLDER