Redirect to 'next' after SSO login

uhepp_org/uhepp_vault/templates/registration/login.html

@@ -19,7 +19,7 @@
         <small class="text-muted">preferred</small>
         </h2>
         <p>Use your CERN account to sign in or create a new account.</p>
-        <p><a tabindex="0" class="btn btn-primary" href="{% url 'oidc_authentication_init' %}">Sign in with CERN SSO</a></p>
+        <p><a tabindex="0" class="btn btn-primary" href="{% url 'oidc_authentication_init' %}{% if request.GET.next %}?next={{ request.GET.next }}{% endif %}">Sign in with CERN SSO</a></p>
     </div>
     <div class="col-md-6 px-4">
         <h2 class="mt-2">Uhepp hub account</h2>