BUG-050: Remove unneccesary braces around variable.

Author: mvousden

jobs/hook_container.yml

@@ -57,7 +57,7 @@
 
 - name: Push the Docker image.
   command: docker push {{ output_image_name }}
-  when: "{{ container_push }}"
+  when: container_push
 
 - name: Destroy the container.
   command: vagrant destroy --force