add drone.yml

.drone.yml

@@ -0,0 +1,11 @@
+kind: pipeline
+name: default
+
+steps:
+	- name: Build docker image
+	  image: docker:latest
+	  volumes:
+        - name: docker_sock
+          path: /var/run/docker.sock
+      commands:
+		- docker build --no-cache -t nsd-docker .