OpenShift Jenkins Slave Image for Ruby 2.5

Dockerfile

FROM openshift/jenkins-slave-base-centos7

ENV RUBY_MAJOR_VERSION=2 \
    RUBY_MINOR_VERSION=5

ENV RUBY_VERSION="${RUBY_MAJOR_VERSION}.${RUBY_MINOR_VERSION}" \
    RUBY_SCL_NAME_VERSION="${RUBY_MAJOR_VERSION}${RUBY_MINOR_VERSION}"

ENV RUBY_SCL="rh-ruby${RUBY_SCL_NAME_VERSION}"

RUN yum install -y centos-release-scl-rh && \
    yum-config-manager --add-repo https://cbs.centos.org/repos/sclo7-rh-ruby25-rh-candidate/x86_64/os/ && \
    echo gpgcheck=0 >> /etc/yum.repos.d/cbs.centos.org_repos_sclo7-rh-ruby25-rh-candidate_x86_64_os_.repo && \
    INSTALL_PKGS=" \
${RUBY_SCL} \
${RUBY_SCL}-ruby-devel \
${RUBY_SCL}-rubygem-rake \
${RUBY_SCL}-rubygem-bundler \
" && \
    yum groupinstall -y 'Development Tools' && \
    yum install -y --setopt=tsflags=nodocs ${INSTALL_PKGS} && \
    yum clean all -y && \
    rpm -V ${INSTALL_PKGS}

RUN echo 'unset BASH_ENV PROMPT_COMMAND ENV && source scl_source enable rh-ruby25 $NODEJS_SCL' > /etc/scl_enable

ENV BASH_ENV=/etc/scl_enable \
    ENV=/etc/scl_enable \
    PROMPT_COMMAND=". /etc/scl_enable"

RUN chown -R 1001:0 $HOME && \
    chmod -R g+rw $HOME

USER 1001