Server not cleaning up expired cache in storage

[Adam Brown]

I've noticed the server is notice properly cleaning up after itself when caching files in the google cloud storage, they should be pruned every 4 minutes but it doesn't seem to be happening

https://github.com/novoda/dashboards/blob/master/server/src/scheduler/component/expired-html-scheduler-component.js

[Adam Brown]

seems like an issue with the google cloud storage api being updated and our custom "expires" being treated as a string and not a number