Build documentation docker file added to drone

.drone.yml

@@ -86,3 +86,25 @@ volumes:
   - name: ubuntu_ccache
     host:
       path: /tmp/ubuntu_ccache
+
+---
+kind: pipeline
+type: docker
+name: documentation_build
+
+clone:
+  depth: 3
+
+
+steps:
+  - name: build_docker_master
+    image: plugins/docker
+    settings:
+      repo: ascee/lasp_ascee_nl
+      tags: latest
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      when:
+        branch: master