Writes a private SSH key encoded in an environment variable
to a file in ~/.ssh.
Only run in non-interactive settings and if the environment variable
exists and is non-empty.
The travis::use_travis_deploy() and use_tic() functions encode a private
key as an environment variable for use with this function.
Usage
step_install_ssh_keys(name = "TRAVIS_DEPLOY_KEY")
Arguments
name
[string]
Name of the environment variable and the target file, default:
"TRAVIS_DEPLOY_KEY".