The docker entrypoint for containers does too much work
https://github.com/docker-library/mariadb/blob/master/docker-entrypoint.sh

The lack of options in mysql_install_db.sh means that the server is restarted several times within a container on initialization.

Unlike the standard model of database deployment where initialization is a rare event, with containers this is now a frequent and time critical function.

aspect to be improve are under these functions

docker_init_database_dir

currently calls mysql_install_db and sets user to normal.

docker_setup_db

mysql_tzinfo_to_sql - removing prepared statement this could be part of mysql_install_db
(aka mysqld --bootstrap).

Support the following root creattion options:

• MYSQL_RANDOM_ROOT_PASSWORD (32 character upper/lower/number random password)
• MYSQL_ROOT_HOST host component for the user
• MYSQL_ROOT_PASSWORD

note: password needs to be saved somehow.

Skip test database creation (backport from 10.2) - 9a8498066865 (limited) + scripts/mysql_test_db.sql + sql/*

Additional user:

• MYSQL_USER
• MYSQL_PASSWORD
• MYSQL_DATABASE

docker_process_init_files

probably need to remain a separate start of mysqld out of bootstrap mode.

to assist in merging upwards without fault

47334649752e (part of 1st hunk of mysql_install._db.sh)