FROM jenkins/jenkins:lts-jdk11

# root is required to modify uid
USER root

ARG DOCKER_GID=998

RUN usermod --uid 1006 jenkins
RUN groupmod --gid 1006 jenkins
RUN chown -R jenkins:jenkins "$JENKINS_HOME" /usr/share/jenkins/ref

RUN groupadd -g ${DOCKER_GID} docker
RUN usermod -aG docker jenkins

# restore ENTRYPOINT to startup as jenkins user
USER jenkins