add .drone.yml

.drone.yml

@@ -4,9 +4,9 @@ name: build
 
 steps:
   - name: Build normal exit image
-    pull: if-not-exists
+    pull: always
     image: plugins/docker
-    privileged: false
+    privileged: true
     settings:
       dockerfile: Dockerfile.normal
       auto-tag: true