Vendir is failing to fetch content if private-key does not have newline at the end

[kumaritanushree]

What steps did you take:
Steps to reproduce the issue:
-> Copy the content from file ~/.ssh/id_rsa (assuming this is the private key file on your system)
-> encode the key by running cmd: pbpaste | base64
-> create vendir.yml

apiVersion: v1
kind: Secret
metadata:
  name: http-auth
data:
  ssh-privatekey:  <paste encoded value of private-key>
---
apiVersion: vendir.k14s.io/v1alpha1
kind: Config
directories:
- path: vendor
  contents:
  - path: dump
    git:
      url: git@github.com:carvel-dev/vendir.git
      ref: origin/develop
      secretRef:
        name: http-auth

-> run vendir sync and you will see the error:

Load key "/Users/ktanushree/code_work/test-repo/.vendir-tmp/incoming/git-auth/private-key": invalid format
  git@github.com: Permission denied (publickey).
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.

vendir: Error: Syncing directory 'vendor':
  Syncing directory 'dump' with git contents:
    Fetching git repository:
      Git [fetch origin main]: exit status 128 (stderr: Load key "/Users/ktanushree/code_work/test-repo/.vendir-tmp/incoming/git-auth/private-key": invalid format
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
)

Note: pbpaste does not add new line but if you will use cat instead of pbpaste you will see newline will get added to your private key. You can try same steps just encode your private key by running command: cat ~/.ssh/id_rsa | base64. This will work fine.

What happened:
[A small description of the issue]

What did you expect:
Vedir should work fine with/without newline in privatekey.

Anything else you would like to add:
Git actually does not work if privatekey does not have newline at the end. So add newline when vendir is writing privateKey in file. Private key with multiple newline also accepted by git.

Environment:

• vendir version (execute vendir --version):
• OS (e.g. from /etc/os-release):

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