[constellation] Django 3.2 is available in bullseye-backports

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

roles/constellation/tasks/main.yml

 ---
-- name: Pin Django from Debian experimental until bullseye-backports exists
+- name: Pin Django from Debian bullseye-backports
   template:
-    src: "apt/{{ item }}.j2"
-    dest: "/etc/apt/{{ item }}"
-  loop:
-    - sources.list.d/experimental.list
-    - preferences.d/django-experimental
+    src: "apt/sources.list.d/bullseye-backports.list.j2"
+    dest: "/etc/apt/sources.list.d/bullseye-backports.list"
 
 - name: Install constellation dependencies
   apt:

roles/constellation/templates/apt/preferences.d/django-experimental.j2

-{{ ansible_header | comment }}
-
-
-Package: *
-Pin: release n=experimental
-Pin-Priority: 1
-
-
-Package: python3-django
-Pin: release n=experimental
-Pin-Priority: 900
-
-
-Package: python3-django-tables2
-Pin: release n=experimental
-Pin-Priority: 900

roles/constellation/templates/apt/sources.list.d/experimental.list.j2 → roles/constellation/templates/apt/sources.list.d/bullseye-backports.list.j2

 {{ ansible_header | comment }}
 
-deb {{ debian_mirror }} experimental main
+deb {{ debian_mirror }} bullseye-backports main