devstack-gate/roles/write-devstack-local-conf/tasks/main.yaml

- name: Write a job-specific local_conf file
  become: true
  become_user: stack
  devstack_local_conf:
    path: "{{ devstack_local_conf_path }}"
    plugins: "{{ devstack_plugins|default(omit) }}"
    services: "{{ devstack_services|default(omit) }}"
    localrc: "{{ devstack_localrc|default(omit) }}"
    local_conf: "{{ devstack_local_conf|default(omit) }}"