Going through the logs, it seems the installation fails at the point below:
TASK [mariadb : include_tasks] *************************************************
task path: /tmp/.bench/bench/playbooks/roles/mariadb/tasks/main.yml:69
fatal: [localhost]: FAILED! => {
"reason": "no action detected in task. This often indicates a misspelled module name, or incorrect module path.\n\nThe error appears to be in '/tmp/.bench/bench/playbooks/roles/mariadb/tasks/mysql_secure_installation.yml': line 14, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Set root Password\n ^ here\n"
}