An error occurred during installation: No such plugin: cloudbees-folder.このプラグイン以外もダメ
SEVERE: ERROR: Signature verification failed in update site 'default' <a href='#' class='showDetails'>(show details)</a><pre style='display:none'>java.security.SignatureException: Signature length not correct: got 512 but was expecting 256解決
jenkins – Official Image | Docker Hub
公式Jenkinsイメージは5年以上前に開発止まっていた
jenkins/jenkinsの利用が推奨とのこと
image: jenkins:2.60.3-alpine
image: jenkins/jenkins:2.389