Dockerfile

FROM jenkins/jenkins:2.204.1-jdk11

# This will skip the wizard UI configuration so you can use Jenkins straight. 
ENV JAVA_OPTS=-Djenkins.install.runSetupWizard=false

# This will install the plugins from "plugins.txt"
COPY plugins.txt /usr/share/jenkins/plugins.txt
RUN /usr/local/bin/install-plugins.sh < /usr/share/jenkins/plugins.txt

# This will copy the Configuration as Code file - init.groovy:/var/jenkins_home/init.groovy.d/init.groovy
# Notice that this is used in conjunction with the enviroment variable CASC_JENKINS_CONFIG defined in docker-compose file 
COPY jcasc.yaml /var/jenkins_home/casc_configs/jcasc.yaml

# Copy startup groovy script
COPY init.groovy /var/jenkins_home/init.groovy.d/init.groovy