auth/docker-entrypoint-initdb.d/mongo-init.js

/* eslint-disable no-undef */
db = db.getSiblingDB(process.env.DB_NAME);
db.createUser({
    user: process.env.DB_USERNAME,
    pwd: process.env.DB_PASSWORD,
    roles: [
        {
            role: 'readWrite',
            db: process.env.DB_NAME,
        },
    ],
});