[paperwork] Send admin cert emails to specific permission, not all staff

Closes #2

paperwork/certification_emails.py

@@ -87,10 +87,11 @@ def admin_email(ordered_queryset):
     return make_multipart_email(
         f"{len(ordered_queryset)} new CMS Certifications issued",
         html_body,
-        # TODO: Admin emails should probably be from a group, not all staff
         to=(
             get_user_model()
-            .objects.filter(is_staff=True)
+            .objects.with_perm(
+                "paperwork.receive_certification_emails", include_superusers=False
+            )
             .values_list("email", flat=True)
         ),
     )

paperwork/migrations/0004_alter_certification_options.py

@@ -0,0 +1,24 @@
+# Generated by Django 4.0.2 on 2022-03-11 20:28
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("paperwork", "0003_alter_certificationversion_id"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="certification",
+            options={
+                "permissions": [
+                    (
+                        "receive_certification_emails",
+                        "Receives notifications of all new certifications",
+                    )
+                ]
+            },
+        ),
+    ]

paperwork/models.py

@@ -109,6 +109,12 @@ class Certification(models.Model):
 
     class Meta:
         db_table = "Certifications"
+        permissions = [
+            (
+                "receive_certification_emails",
+                "Receives notifications of all new certifications",
+            ),
+        ]
 
 
 class InstructorOrVendor(models.Model):