docker transporter sets ansible_os_family to hosts value instead of undefined.

SUMMARY

When dynamically adding a host to the inventory using community.docker.docker and ansible.builtin.add_host the value of ansible_os_family is inherited from the host instead of being set to undefined

ISSUE TYPE

Bug Report

COMPONENT NAME

community.docker.docker

ANSIBLE VERSION

ansible [core 2.17.2]
  config file = /home/user/git/ansible.cfg
  configured module search path = ['/home/user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/user/git/venv/lib/python3.12/site-packages/ansible
  ansible collection location = /home/user/git
  executable location = /home/user/git/venv/bin/ansible
  python version = 3.12.4 (main, Jun  7 2024, 06:33:07) [GCC 14.1.1 20240522] (/home/user/git/venv/bin/python)
  jinja version = 3.1.4
  libyaml = True

COLLECTION VERSION

# /home/user/git/ansible_collections
Collection       Version
---------------- -------
community.docker 3.12.0

CONFIGURATION

ANSIBLE_PIPELINING(/home/user/git/ansible.cfg) = True
BECOME_ALLOW_SAME_USER(/home/user/git/ansible.cfg) = True
CACHE_PLUGIN(/home/user/git/ansible.cfg) = ansible.builtin.jsonfile
CACHE_PLUGIN_CONNECTION(/home/user/git/ansible.cfg) = ./fact_cache
COLLECTIONS_PATHS(/home/user/git/ansible.cfg) = ['/home/user/git']
CONFIG_FILE() = /home/user/git/ansible.cfg
DEFAULT_BECOME(/home/user/git/ansible.cfg) = True
DEFAULT_FORCE_HANDLERS(/home/user/git/ansible.cfg) = True
DEFAULT_FORKS(/home/user/git/ansible.cfg) = 50
DEFAULT_GATHERING(/home/user/git/ansible.cfg) = smart
DEFAULT_LOG_PATH(/home/user/git/ansible.cfg) = /home/user/git/logs
DEFAULT_MANAGED_STR(/home/user/git/ansible.cfg) = This file is managed by ansible - local changes will be lost
DEFAULT_REMOTE_USER(/home/user/git/ansible.cfg) = root
DEFAULT_TRANSPORT(/home/user/git/ansible.cfg) = ssh
DEFAULT_VAULT_PASSWORD_FILE(/home/user/git/ansible.cfg) = /home/user/git/.vpass
DEPRECATION_WARNINGS(/home/user/git/ansible.cfg) = True
RETRY_FILES_ENABLED(/home/user/git/ansible.cfg) = False
SHOW_CUSTOM_STATS(/home/user/git/ansible.cfg) = True
SYSTEM_WARNINGS(/home/user/git/ansible.cfg) = True
USE_PERSISTENT_CONNECTIONS(/home/user/git/ansible.cfg) = True

OS / ENVIRONMENT

ArchLinux

STEPS TO REPRODUCE

Spanw a debian container and store it's name in container_name.

- name: Add container to inventory
  ansible.builtin.add_host:
    host: '{{ container_name }}'
    ansible_connection: community.docker.docker
    ansible_docker_extra_args: '-H {{ dockerhost }}'
    ansible_become: false
  changed_when: false
- name: Check ansible pre requirements inside container
  delegate_to: '{{ container_name }}'
  delegate_facts: true
  ansible.builtin.import_role:
    name: some_role

And the main.yml of some_role is:

- ansible.builtin.debug:
    msg: >-
      ansible_os_family is set to '{{ ansible_os_family|default("UNDEFINED") }}'

Note: The setup module has not yet been ran in this case, the ssh transporter in these cases results in ansible_os_family being undefined.

EXPECTED RESULTS

Debug message of ansible_os_family is set to "UNDEFINED"

ACTUAL RESULTS

ansible_os_family is set to Archlinux

ansible-collections / community.docker