Environment Variables Deploy Key Special Characters

How can or where can I access this file ci/README.md for how to create and set this key

I need help understanding editing an SSH for special characters, I’ve read the documentation and have followed it as closely as possible. Issue: I have created a key pair with git, the public is in the deploy section of our repo and I have edited the private key wrapping it in " (qoutes/double qoutes) and added \n at every new line starting at BEGIN OPENSSH PRIVATE KEY—\n to the very last YH\n

*I have tried every which way, created pair after pair, checked to make sure the key isn’t corrupt but am still getting
Warning: Permanently added the RSA host key for IP address ‘some ip’ to the list of known hosts.
426Permission denied (publickey).
427fatal: Could not read from remote repository.

*We are using wpvip. I don’t know what else to do but it is affecting our deployment.