This copies your compile-time
~/.curlrc files to the app directory.
This files are usually created with other buildpacks such as https://github.com/bjeanes/ssh-private-key-buildpack or https://github.com/timshadel/heroku-buildpack-github-netrc
Probably not. These creds belong at compile time for a reason. This exists for the few limited cases where your app needs run-time access to things like GitHub. This buildpack exists to be composed with other buildpacks (such as those mentioned above) to avoid duplicating their functionality here.
Copy the snippet above into CLI.