add sms sender to old script

we have problems where govuk service is not migrated to sms_senders on new datbases.
update this old script so we don't affect live systems, but when people rebuild their
database from scratch they get the sms sender for govuk notify.

migrations/versions/0118_service_sms_senders.py

@@ -32,6 +32,13 @@ def upgrade():
                     unique=True)
     op.create_index(op.f('ix_service_sms_senders_service_id'), 'service_sms_senders', ['service_id'], unique=True)
 
+    # populate govuk seeded service
+    op.execute("""
+        INSERT INTO service_sms_senders
+        (id, sms_sender, service_id, is_default, inbound_number_id, created_at, updated_at)
+        VALUES ('286d6176-adbe-7ea7-ba26-b7606ee5e2a4', 'GOVUK', 'd6aa2c68-a2d9-4437-ab19-3ae8eb202553', true, null, now(), null)
+    """)
+
 
 def downgrade():
     op.drop_index(op.f('ix_service_sms_senders_service_id'), table_name='service_sms_senders')