Currently there is no official Docker image distribution for Jenkinsfile Runner. Although the images can be produced by Custom WAR Packager (blog: https://jenkins.io/blog/2018/10/16/custom-war-packager/#jenkinsfile-runner-packaging ), it might be complicated for some users who just want to get a ready-to-fly image. There is already an image which could be distributed as official package: https://github.com/jenkinsci/jenkinsfile-runner/blob/master/Dockerfile 

Acceptance criteria:

• There is an official JFR package on https://hub.docker.com/u/jenkins
• Jenkinsfile is updated to support running on both ci.jenkins.io and Trusted CI
• For Trusted CI Jenkinsfile triggers on releases and deploys new JFR versions with version tags
• There are Java 8 and Java 11 tags
• There is "latest" tag, probably pointing to the last Java 8 image