FROM ubuntu:focal RUN apt-get update -qq && \ apt-get install -y \ autoconf \ build-essential \ git \ libedit-dev \ wget WORKDIR /app RUN wget https://cache.ruby-lang.org/pub/ruby/3.0/ruby-3.0.0.tar.gz && \ tar xfz ruby-3.0.0.tar.gz && \ cd ruby-3.0.0 && \ autoconf && \ ./configure --prefix=/opt && \ make install