.cfignore is used to ignore certain files when pushing code to Cloud Foundry . (see this)
It's pretty common in IBM Cloud. Here's a Github search for it
Maybe it could be something like this:

Added it:

Thank you for the request 馃憤
The icon will be available with the next update!
Most helpful comment
Added it:
Thank you for the request 馃憤
The icon will be available with the next update!