Add 'installbox' configuration.

roles/preseed-installer/tasks/main.yml

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+- name: make preseed directory available
+  file:
+    path: "{{ tftp_root }}/d-i/{{ di_dist }}"
+    state: directory
+
+- name: provide preseed file
+  template:
+    src: preseed.cfg
+    dest: "{{ tftp_root }}/d-i/{{ di_dist }}"
+
+- name: make installbox resolvable in /etc/hosts from LAN
+  replace:
+    dest: /etc/hosts
+    regexp: '(127.0.1.1\s+)installbox'
+    replace: '\1localhost\n{{ ipaddr_lan }}	installbox'
+
+- name: add auto boot entry to di-netboot-assistant
+  blockinfile:
+    dest: /etc/di-netboot-assistant/pxelinux.HEAD
+    insertbefore: EOF
+    block: |
+      LABEL quick
+      MENU LABEL Debian Installer ({{ di_dist }} ; amd64 + Preseed)
+      kernel ::/di-netboot-pkg/images/9/amd64/text/debian-installer/amd64/linux
+      append initrd=::/di-netboot-pkg/images/9/amd64/text/debian-installer/amd64/initrd.gz auto=true priority=critical url=tftp://installbox
+      TIMEOUT 100
+  notify: "rebuild di-netboot-assistant menu"

roles/preseed-installer/templates/preseed.cfg

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+#### Preconfiguration file
+## For more examples and comments:
+##   https://www.debian.org/releases/stable/example-preseed.txt
+
+## To change default values:
+#d-i foo/bar string value
+#d-i foo/bar seen false
+
+## Use this as boot parameter:
+## DEBCONF_DEBUG=5
+## Boot parameter locale?=de_DE
+
+# Preseeding only locale sets language, country and locale:
+d-i debian-installer/locale string de_DE
+d-i keyboard-configuration/xkb-keymap select de
+
+## Skip root account:
+d-i passwd/root-login boolean false
+
+### Apt setup
+d-i apt-setup/non-free boolean true
+d-i apt-setup/contrib boolean true
+d-i mirror/http/mirror string {{ deb_mirror }}
+
+### Ansible User
+d-i passwd/user-fullname string Ansible User
+d-i passwd/username string ansible
+d-i passwd/user-password password insecure
+d-i passwd/user-password-again password insecure
+#d-i passwd/user-password-crypted password [crypt(3) hash]
+
+### Package selection
+tasksel tasksel/desktop multiselect standard openssh-server
+tasksel tasksel/desktop seen false
+
+# Individual additional packages to install
+d-i pkgsel/include string firmware-linux