Added drone step to build

.drone.yml

@@ -8,6 +8,14 @@ clone:
     tags: true
 
 pipeline:
+  build:
+    image: publysher/hugo
+    pull: true
+    commands:
+      - hugo
+    when:
+      event: [ push, tag, pull_request ]
+
   docker:
     image: plugins/docker
     pull: true