Create group docker before creating docker-folder

[dm2002]

As described in #1 the system/task/main.yml tries to create the docker_folder with the owner group "docker", but this group does not exist at this moment.
Added task for creation of group docker before create docker_folder task

[BrinRe]

Danke @dm2002 .
Auf meiner nackten Maschine gab es auch keine docker Gruppe...

[prometoys]

My recommendation would be to create the docker group as a system group

- name: Ensure group "docker" exists with system gid
  ansible.builtin.group:
    name: docker
    state: present
    system: yes