logout stops working with Django >4.0

[jorge-leon]

Describe the bug

Since Django 4.1 the contributed LogoutView requires the POST method, see:

https://docs.djangoproject.com/en/4.1/releases/4.1/#log-out-via-get

Find attached a patch which replaces the logout link (<a href=...) with a form. In order to maintain formatting
a label with a hidden submit button is used. I do not know if this works for all browsers.

django_logout_post.patch.txt

Note: in urls.py the next_page parameter uses a plain ../ which might not do what is meant in all situations. It could be
replaced by reverse_lazy("helpdesk:home"), however I plan to integrate a more general solution in a future PR for improving
integration of django-helpdesk into a django-project with other apps.

To Reproduce
Steps to reproduce the behavior:

1. Install django-helpdesk with a Django version greater or equal to 4.1
2. Set up a user and login
3. Click on the "Logout" link in the user dropdown
4. Click on the back button of the browser and optionally reload
5. The user is still logged in.

Expected behavior

The user is logged out

[uhurusurfa]

👍 Look forward to the PR

[jorge-leon]

👍 Look forward to the PR

Hi uhurusurfa: please consider the attached patch, it's almost trivial, and my resources are bound. I have more enhancements with broader scope in preparation on which I'd like to focus.