This commit adds a new feature to the playbook that configures DNS settings for a Samba AD DC. It includes changes to the `defaults/main.yml` file, `tasks/install.yml`, `tasks/preparing.yml`, `tasks/verify.yml`, and `templates/resolv.conf.j2` files.
Added a new line to the `resolv.conf.j2` template to specify the Ansible-managed DNS server (`{{ addc_ansible_host }}`). This ensures that the system uses both the local host and the managed DNS server for DNS resolution.
