paperwork: Add deskers mailing list

paperwork/api.py

@@ -1,5 +1,5 @@
-from django.db.models import Prefetch
 from rest_framework import routers, serializers, viewsets
+from django.db.models import Prefetch, Q
 from rest_framework.decorators import action
 from rest_framework.response import Response
 
@@ -98,6 +98,21 @@ class DepartmentViewSet(viewsets.ModelViewSet):
             },
         }
 
+        # TODO: this isn't really in the domain of the `paperwork` app...
+        deskers = (
+            Member.objects.with_is_active()
+            .filter(is_active=True)
+            .filter(
+                Member.objects.has_flag("label", "Volunteer: Desker")
+                | Q(billing_method__startswith="Desker")
+            )
+        )
+        lists["Deskers"] = {
+            "members": {
+                desker.sanitized_mailbox(use_volunteer=True) for desker in deskers
+            }
+        }
+
         return Response(lists)