CODE EXAMPLE FOR SHELL

custom jenkins dockerfile

FROM jenkins/jenkins:2.332.2-jdk11
USER root
RUN apt-get update && apt-get install -y lsb-release
RUN curl -fsSLo /usr/share/keyrings/docker-archive-keyring.asc 
  https://download.docker.com/linux/debian/gpg
RUN echo "deb [arch=$(dpkg --print-architecture) 
  signed-by=/usr/share/keyrings/docker-archive-keyring.asc] 
  https://download.docker.com/linux/debian 
  $(lsb_release -cs) stable" > /etc/apt/sources.list.d/docker.list
RUN apt-get update && apt-get install -y docker-ce-cli
USER jenkins
RUN jenkins-plugin-cli --plugins "blueocean:1.25.3 docker-workflow:1.28"