Instanceof operator was not working so changed the way of checking it

docker/playbook.yml

@@ -9,14 +9,16 @@
 
   tasks:
     - name: Copy dockerfile
-      synchronize: src=app dest=/tmp
+      synchronize:
+        src: app
+        dest: "/tmp/{{ host_directory }}"
 
     - name: Build brewman image
       docker_image:
         name: brewman:latest
         build:
-          path: /tmp/app/
-          dockerfile: /tmp/app/Dockerfile
+          path: "/tmp/{{ host_directory }}/"
+          dockerfile: "/tmp/{{ host_directory }}/Dockerfile"
           pull: yes
         state: present
         source: build