enable worker service

tasks/buildbot-worker.yaml

@@ -41,7 +41,8 @@
 
 - meta: flush_handlers
 
-- name: ensure buildbot-worker service is running
+- name: ensure buildbot-worker service is running and enabled
   systemd:
     state: started
     name: buildbot-worker@{{buildbot_worker_name}}.service
+    enabled: true