add push to hub

.drone.yml

@@ -10,7 +10,17 @@ steps:
   - name: docker_sock
     path: /var/run/docker.sock
   commands:
-  - docker build --no-cache -t nsd-docker .
+      - docker build --no-cache -t j10l/nsd-docker:latest .
+
+steps:
+- name: push docker image
+  image: plugins/docker
+  settings:
+      repo: j10l/nsd-docker
+      username:
+          from_secret: docker_username
+      password:
+          from_secret: docker_password
 
 volumes:
 - name: docker_sock