Drone: add k8s rollout step

.drone.yml

@@ -46,4 +46,13 @@ steps:
 #    when:
 #      event:
 #        - tag
+#        - promote
+
+  - name: k8s rollout
+    image: bitnami/kubectl:latest
+    commands:
+      - kubectl rollout restart -n noded deployment/frontend
+#    when:
+#      event:
+#        - tag
 #        - promote