This is a formula for an EC2 instance without any credentials in it, but that should be able to run builder to check out the Continuum projects and instantiate them on AWS.
The key provided here should give access to the thedailybugle.org's builder-private copy. You may see a 404 at this link, because as the name says this is a private repository used for testing on AWS and Github accounts not tied in any way to eLife.