In my use-case, I need to use the same Jenkinsfile on multiple Jenkins instances. The only differentiation between the two are the credentials which are available for use. (Basically, one instance is authorized for deployments, thus the credentials, the other is not).

My ideal would be a credentials global variable, or something like that, which could have utility methods like this. E.g.

node {
  if (credentials.lookup('some-credentials-id')) {
    withCredentials('some-credentials-id') {
      sh './deploy.sh'
    }
  }
}

Related to JENKINS-37863