Maybe this is helpful for someone, this I am using now in *-finalize-after deploy hook for preparing WordPress in order to install other languages on a yet non-prepared site:
- name: Install WP (required for installing languages on empty site)
command: wp core {{ project.multisite.enabled | default(false) | ternary('multisite-install', 'install') }}
--allow-root
--url="{{ site_env.wp_home }}"
{% if project.multisite.enabled | default(false) %}
--base="{{ project.multisite.base_path | default('/') }}"
--subdomains="{{ project.multisite.subdomains | default('false') }}"
{% endif %}
--title="{{ project.site_title | default(site) }}"
--admin_user="{{ project.admin_user | default('admin') }}"
--admin_password="{{ vault_wordpress_sites[site].admin_password }}"
--admin_email="{{ project.admin_email }}"
args:
chdir: "{{ deploy_helper.current_path }}"
register: wp_install
changed_when: "'WordPress is already installed.' not in wp_install.stdout and 'The network already exists.' not in wp_install.stdout"