Why is the checkout step asking for an rsa key?

Build Environment
1

I have setup our CircleCI build process, and while working on this in a branched pull request setup everything was working. After the merge I see the build hanging on a prompt for an rsa key? I looked at this document since I thought it might be related:

https://circleci.com/docs/2.0/gh-bb-integration/#enable-your-project-to-check-out-additional-private-repositories

But I’m still not sure why this would happen?

https://circleci.com/gh/pymssql/pymssql/154

Cloning into '.'...
Warning: Permanently added the RSA host key for IP address '192.30.253.112' to the list of known hosts.

Enter passphrase for key '/home/circleci/.ssh/id_rsa':
2

This happens if your key is encrypted. CircleCI does not support using encrypted keys. Please use an unencrypted key for this portion of your build.