Docker Compose does not set root password for new container

root@demo30-ourcompose-com--2020-04-09-02-10:~# docker inspect root_db_1

[]

Error: No such object: root_db_1

root@demo30-ourcompose-com--2020-04-09-02-10:~# cat stack.yml 

# Use root/example as user/password credentials

version: '3.6'

services:

  db:

    image: "mariadb:10.4"

    restart: always

    environment:

        MYSQL_ROOT_PASSWORD: "quEfaBHnAFmad7Fs"

root@demo30-ourcompose-com--2020-04-09-02-10:~# docker-compose -f stack.yml up | grep 'PLEASE REMEMBER' -A 20

Creating root_db_1 ... done

db_1  | PLEASE REMEMBER TO SET A PASSWORD FOR THE MariaDB root USER !

db_1  | To do so, start the server, then issue the following commands:

db_1  | 

db_1  | '/usr/bin/mysqladmin' -u root password 'new-password'

db_1  | '/usr/bin/mysqladmin' -u root -h  password 'new-password'

db_1  | 

db_1  | Alternatively you can run:

db_1  | '/usr/bin/mysql_secure_installation'

db_1  | 

db_1  | which will also give you the option of removing the test

db_1  | databases and anonymous user created by default.  This is

db_1  | strongly recommended for production servers.

db_1  | 

db_1  | See the MariaDB Knowledgebase at http://mariadb.com/kb or the

db_1  | MySQL manual for more instructions.

db_1  | 

db_1  | Please report any problems at http://mariadb.org/jira

db_1  | 

db_1  | The latest information about MariaDB is available at http://mariadb.org/.

db_1  | You can find additional information about the MySQL part at:

db_1  | http://dev.mysql.com