Dockerfile for ruby-centos7

Dockerfile

FROM centos:7 as builder

RUN yum install -y git make gcc bzip2 openssl-devel libyaml-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel && \
  git clone https://github.com/rbenv/ruby-build.git && \
  PREFIX=/usr/local ./ruby-build/install.sh

ARG RUBY_VERSION
ENV RUBY_VERSION=${RUBY_VERSION:-2.7.3}
ENV RUBY_DIR=/usr/local/ruby-${RUBY_VERSION}
RUN /usr/local/bin/ruby-build ${RUBY_VERSION} ${RUBY_DIR}

FROM centos:7

RUN yum install -y openssl libyaml libffi readline zlib gdbm ncurses

ARG RUBY_VERSION
ENV RUBY_VERSION=${RUBY_VERSION:-2.7.3}
ENV RUBY_DIR=/usr/local/ruby-${RUBY_VERSION}
COPY --from=builder ${RUBY_DIR} ${RUBY_DIR}

ENV GEM_HOME=/tmp/gems
VOLUME ${GEM_HOME}

ENV PATH=/tmp/gems/bin:${RUBY_DIR}/bin:${PATH}

CMD irb