Setup RemoteUserAuthentication

- user will be authenticated using the reverse proxy in front of the
  CATS application

django_cats/settings.py

@@ -52,6 +52,7 @@ MIDDLEWARE = [
     "django.middleware.common.CommonMiddleware",
     "django.middleware.csrf.CsrfViewMiddleware",
     "django.contrib.auth.middleware.AuthenticationMiddleware",
+    "django.contrib.auth.middleware.PersistentRemoteUserMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
 ]
@@ -83,22 +84,8 @@ WSGI_APPLICATION = "django_cats.wsgi.application"
 DATABASES = {"default": env.dj_db_url("DATABASE_URL")}
 
 
-# Password validation
-# https://docs.djangoproject.com/en/4.2/ref/settings/#auth-password-validators
-
-AUTH_PASSWORD_VALIDATORS = [
-    {
-        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
-    },
-    {
-        "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
-    },
-    {
-        "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
-    },
-    {
-        "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
-    },
+AUTHENTICATION_BACKENDS = [
+    "django.contrib.auth.backends.RemoteUserBackend",
 ]