♻️(mails) link email from current site

The link in the email was pointing on the
staging website. We now use a variable to
target the current site setup in the database.

src/backend/core/models.py

@@ -12,6 +12,7 @@
 from django.conf import settings
 from django.contrib.auth import models as auth_models
 from django.contrib.auth.base_user import AbstractBaseUser
+from django.contrib.sites.models import Site
 from django.core import exceptions, mail, validators
 from django.db import models, transaction
 from django.template.loader import render_to_string
@@ -660,6 +661,7 @@ def email_invitation(self):
             with override(self.issuer.language):
                 template_vars = {
                     "title": _("Invitation to join Desk!"),
+                    "site": Site.objects.get_current()
                 }
                 msg_html = render_to_string("mail/html/invitation.html", template_vars)
                 msg_plain = render_to_string("mail/text/invitation.txt", template_vars)

src/backend/core/tests/test_models_invitations.py

@@ -264,6 +264,7 @@ def test_models_team_invitations_email():
 
     email_content = " ".join(email.body.split())
     assert "Invitation to join Desk!" in email_content
+    assert "[//example.com]" in email_content
 
 
 @mock.patch(

src/mail/mjml/invitation.mjml

@@ -35,7 +35,7 @@
               <li>{% trans "Facilitate exchanges and communication with our messaging and group discussion tools."%}</li>
             </ul>
           </mj-text>
-          <mj-button href="https://desk-staging.beta.numerique.gouv.fr/" background-color="#000091" color="white" padding-bottom="30px">
+          <mj-button href="//{{site.domain}}" background-color="#000091" color="white" padding-bottom="30px">
             {% trans "Visit Equipes"%}
           </mj-button>
           <mj-text>{% trans "We are confident that Equipes will help you increase efficiency and productivity while strengthening the bond among members." %}</mj-text>