create-ssh-credential.groovy

import com.cloudbees.jenkins.plugins.sshcredentials.impl.*
import com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey.DirectEntryPrivateKeySource
import com.cloudbees.plugins.credentials.*
import com.cloudbees.plugins.credentials.domains.*
import com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl

String username = System.getenv('JENKINS_ADMIN_USER') ?: 'adminuser'
String password = System.getenv('JENKINS_ADMIN_PASSWORD') ?: 'adminpassword'

//
// Create adminuser-repo-private-key-id private key credential
//
String privateKeyText = new File('/ssh-keys/adminuser-repo-private-key').text
DirectEntryPrivateKeySource privateKeySource = new DirectEntryPrivateKeySource(privateKeyText)
Credentials privateKeyCredential = new BasicSSHUserPrivateKey(
  CredentialsScope.GLOBAL,     // scope
  'admin-repo-private-key-id', // id
  username,                    // username
  privateKeySource,            // private key source
  '',                          // passphrase
  'Admin user SSH key'         // description
)
SystemCredentialsProvider.getInstance().getStore().addCredentials(Domain.global(), privateKeyCredential)

//
// Create admin-username-password-id username/password credential
//
Credentials usernamePasswordCredential = new UsernamePasswordCredentialsImpl(
  CredentialsScope.GLOBAL,      // scope
  'admin-username-password-id', // id
  'Admin username/password',    // description
  username,                     // username
  password                      // password
)
SystemCredentialsProvider.getInstance().getStore().addCredentials(Domain.global(), usernamePasswordCredential)