Test the note kfet with Debian Bullseye, Python 3.9 and Django 2.2

Signed-off-by: Yohann D'ANELLO <yohann.danello@gmail.com>

.gitlab-ci.yml

@@ -38,6 +38,21 @@ py38-django22:
         python3-bs4 python3-setuptools tox texlive-xetex
   script: tox -e py38-django22
 
+# Debian Bullseye
+py39-django22:
+  stage: test
+  image: debian:bullseye
+  before_script:
+    - >
+        apt-get update &&
+        apt-get install --no-install-recommends -y
+        python3-django python3-django-crispy-forms
+        python3-django-extensions python3-django-filters python3-django-polymorphic
+        python3-djangorestframework python3-django-oauth-toolkit python3-psycopg2 python3-pil
+        python3-babel python3-lockfile python3-pip python3-phonenumbers python3-memcache
+        python3-bs4 python3-setuptools tox texlive-xetex
+  script: tox -e py39-django22
+
 linters:
   stage: quality-assurance
   image: debian:buster-backports

tox.ini

@@ -6,6 +6,9 @@ envlist =
     # Ubuntu 20.04 Python
     py38-django22
 
+    # Debian Bullseye Python
+    py39-django22
+
     linters
 skipsdist = True