update drone with cd, add caching

.drone.yml

@@ -14,3 +14,20 @@ steps:
       insecure: true
       dockerfile: Dockerfile
       tags: latest
+      cache_from: registry.local/northcode/aur
+  - name: deploy
+    image: pelotech/drone-helm3
+    settings:
+      helm_command: upgrade
+      skip_tls_verify: true
+      chart: ./helm
+      release: aurutils
+      namespace: aurutils
+      values_files: [ './helm/values.yml' ]
+      secrets: [ kube_token ]
+      kube_service_account: 'aurutils/aurutils-svca'
+      kube_api_server: 'https://kubernetes.default.svc.cluster.local'
+      kube_token:
+        from_secret: kube_token
+    when:
+      branch: [master]