Since 2016 November, Shifter starts to support RSS feed to your generated site.
Generated feed comply with WordPress Feeds.
Feed URL
The URL of RSS feed on Shifter will be https://www.example.com/feed/ .
Here is a sample code to insert RSS feed URL in the header:
<link rel="alternate" type="application/rss+xml" title="RSS feed" href="https://www.example.com/feed/">
You can also register it to Feedburner
Log-in to Feedburner and register a new feed then click [Next]
Give a feed a Title, feed URL then click [Next]
Now you've gotton Feedburner feed for your Shifter site.
That's all!