As part of https://issues.jenkins-ci.org/browse/JENKINS-55642, I've opened https://github.com/jenkinsci/jenkinsfile-runner/pull/99.
The builder is failing with this error:
ERROR: Could not find credentials entry with ID 'jenkins-dockerhub'
so we need the credentials for dockerhub to be set up in this job
See the full log here: https://ci.jenkins.io/blue/organizations/jenkins/Tools%2Fjenkinsfile-runner/detail/PR-99/14/pipeline
Jenkinsfile Runner CI Pipeline is unstable
Create experimental "vanilla" Docker packages for the Vanilla version of JFR