keyserver/mongo-init.js

db.createUser(
        {
            user: process.env.MONGO_INITDB_ROOT_USERNAME,
            pwd: process.env.MONGO_INITDB_ROOT_PASSWORD,
            roles: [
                {
                    role: "readWrite",
                    db: process.env.MONGO_INITDB_DATABASE
                }
            ]
        }
);