@paul-tavares would like to be able to override users and roles locally for kbn/es serverless without changing source code. Its specific to the security serverless project and the role names could conflict with other roles used in the other serverless projects.

ES serverless requires using file realm users, and we're using bind mounts for the relevant files in kbn-es/src/serverless_resources. We can allow overriding configuration files with the existing -F option and setup the proper paths.