krel release-notes with --create-website-pr errors with git ssh fingerprint

[csantanapr]

What happened:

Trying to generate the PRs to update the website https://kubernetes.io/releases/ with missing release notes for patch releases.

Running the command

krel release-notes --fix --fork csantanapr --tag v1.22.1 --list-v2 --create-website-pr --log-level trace

Noticed I'm only using the flag --create-website-pr
If you using both flags --create-draft-pr and --create-website-pr it works because the git clone will be done with https (create-draft-pr) and the create-website function will skip the git clone using ssh

Here is the background on the problem go-git/go-git#411

I proposed we switch to https cloning since for k/k, this is consistence and it always works

What you expected to happen:

To not have errors and creates the PR

How to reproduce it (as minimally and precisely as possible):

• Create rsa private key pair for github
• Setup known hosts file
• Run the command

krel release-notes --fix --fork csantanapr --tag v1.22.1 --list-v2 --create-website-pr --log-level trace

Anything else we need to know?:

❯ krel release-notes --fix --fork csantanapr --tag v1.23.1 --list-v2 --create-website-pr
INFO Checking if a PR can be created from csantanapr/release-notes
Create website pull request? (Y/n) (1/10)
y
INFO Generating release notes for tag v1.23.1
INFO Cloning kubernetes/sig-release to read mapping files
INFO Cloning kubernetes/kubernetes
ERRO Clone repository failed. Tracked progress:
FATA creating website PR: generating release notes in JSON format: cloning default github repo: unable to clone repo: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

It errors with git ssh problems like this. Notice that is trying to git clone with ssh git clone git@github.com/kubernetes/kubernetes
DEBU Using repository url "git@github.com:kubernetes/kubernetes" file="git/git.go:371

I have a private ssh key in ~/.ssh/id_rsa
And have the correct known_hosts

ssh-keyscan github.com > ~/.ssh/known_hosts
``
I'm able to git clone using `git`

git clone git@github.com/kubernetes/kubernetes

I can even test the ssh connection

$ ssh -T git@github.com
Hi mojotx! You've successfully authenticated, but GitHub does not provide shell access.

#### Environment:

- OS (e.g: `cat /etc/os-release`): MacOS and Ubuntu

[csantanapr]

/assign

[csantanapr]

Found the fix for this if you can to get krel release-notes to work with git ssh

Add your private key to SSH Agent, even if you don't have a passphrase or even if you're using MacOS and git clone is working ssh.

ssh-add ~/.ssh/<id_ed25519 or id_rsa or privatekey_to_use_for_github_dot_com>

cc @puerco

We could add this requirement in the docs in addition of getting a GITHUB_TOKEN to configure ssh access to github.com, but I would prefer to be consistent and do not add the extra prereq.