FROM mysql
RUN mysql_config_editor set --login-path=local --user=root --password

root@d80484a3177f:~# mysql_config_editor set --login-path=local --user=root --password
Enter password:

root@d80484a3177f:~# mysql_config_editor set --login-path=local --user=root --password=root
mysql_config_editor: [ERROR] mysql_config_editor: option '--password' cannot take an argument