trixie/roles/tftp-netboot-installer/tasks/main.yml

- name: add stretch-backports
  apt_repository:
    repo: deb http://deb.debian.org/debian/ stretch-backports main
    state: present

- name: install di-netboot-assistant from backports
  apt:
    name:
      - di-netboot-assistant
    default_release: stretch-backports
    update_cache: yes

- name: add installer package
  apt:
    name:
      - debian-installer-9-netboot-amd64

- name: bind mount images
  mount:
    path: "{{ tftp_root }}/d-i/n-pkg/"
    src: /usr/lib/debian-installer/
    fstype: none
    opts: bind
#    state: mounted   BEGINN WORKAROUND
    state: present
  register: fstab

- file: path="{{ tftp_root }}/d-i/n-pkg/" state=directory recurse=yes

- name: Reload fstab
  command: mount -a
  when: fstab.changed
# https://github.com/ansible/ansible/issues/23487 END WORKAROUND

- name: configure dnsmasq
  template:
    src: dnsmasq-tftp-netboot-installer.j2
    dest: /etc/dnsmasq.d/tftp-netboot-installer
  notify:
    - restart dnsmasq
    - rebuild di-netboot-assistant menu