add drone

.drone.yml

@@ -0,0 +1,20 @@
+kind: pipeline
+type: docker
+name: default
+steps:
+  - name: deploy
+    image: docker/compose
+    volumes:
+      - name: cache
+        path: /var/run/docker.sock
+    commands:
+      - docker-compose up -d --build
+    when:
+      branch:
+        - master
+      event:
+        - push
+volumes:
+  - name: cache
+    host:
+      path: /var/run/docker.sock