nodebb_ynh/conf/config.json

{
    "url": "https://__DOMAIN__",
    "secret": "__SECRET__",
    "database": "postgres",
    "port": "__PORT__",
    "postgres": {
        "host": "127.0.0.1",
        "port": "5432",
        "username": "db_user",
        "password": "db_pass",
        "database": "db_name"
    }
}