Enable clean-offload-build.timer unit

roles/archbuild/tasks/main.yml

@@ -108,6 +108,7 @@
   with_items:
     - clean-chroots.timer
     - clean-dests.timer
+    - clean-offload-build.timer
 
 - name: install makepkg.conf
   template: src=makepkg.conf.j2 dest=/etc/makepkg.conf owner=root group=root mode=0644