Jenkinsfile example for: https://medium.com/devopslinks/a-hacky-hackers-guide-to-hacking-together-jenkins-scripted-pipelines-and-getting-them-to-do-things-a1e943cb8d11

hacky-hackers-guide-1.4

stage('get code') {
  node('jenkins-worker') {
    // just by specifying your git credentials and repo, the pipeline knows to check it out and run the next steps from that repo    
    git credentialsId: '$key', url: 'git@github.com:$usr/$repo.git',     branch: "${env.BRANCH_NAME}"
      // this is a script in the root of the $repo.git repository
      sh './run-me.sh'
  }
}