Accessing Private Repositories

Hi,

I am trying to add an ssh key for installing private git repositories for my build script. This is a requirement for php composer to access other private packages.

First problem occured when rsa fingerprint is not added automatically so I added a script command:

• mkdir ~/.ssh
  
• chmod 700 ~/.ssh
  
• echo 'bitbucket.org,131.103.20.168 SOMECHARS' > ~/.ssh/known_hosts

That solved fingerprint problem. After that I tried to added an private key from command line but I need to add it securely. So I tried to add private key via environment variable but env vars removes new lines and that didn't work either.

• echo $PRIVATE_KEY > ~/.ssh/private_rsa
  
• chmod 600 ~/.ssh/private_rsa
  
• eval ssh-agent -s
  
• ssh-add ~/.ssh/private_rsa

Is there any way to add a private key or accessing our own private repositories somehow?