Dockerfile to install Ubuntu 20.04 with any version of Ruby.
Ruby version 3.0.1 will be installed by default.
But you can change the version in dockerfile or use the RUBY_VERSION argument on the command line
docker build -t ubuntu-ruby --build-arg RUBY_VERSION=2.5.0 .Available on Docker Hub.
The package uses rbenv to install ruby.
To install Ruby version 2.3.8 or below, you need to uncomment in the Dockerfile
RUN echo "deb http://security.ubuntu.com/ubuntu bionic-security main" | tee -a /etc/apt/sources.list
RUN apt-get update && apt-cache policy libssl1.0-dev
RUN apt-get purge -y libssl-dev
RUN apt-get install -y libssl1.0-dev