jenv inside Docker container image

Dockerfile

#Build and run with a specific version of java within the build image
#eg Java 11: docker build --build-arg JAVA_VERSION=11 -t jenv .
#eg Java 8: docker build --build-arg JAVA_VERSION=1.8 -t jenv .

FROM debian:buster

RUN apt update && apt install -y ca-certificates wget

RUN wget -O- https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.8%2B10/OpenJDK11U-jdk_x64_linux_hotspot_11.0.8_10.tar.gz | tar -xz -C /opt/
RUN wget -O- https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u265-b01/OpenJDK8U-jdk_x64_linux_hotspot_8u265b01.tar.gz | tar -xz -C /opt/
RUN wget -O- https://github.com/jenv/jenv/archive/0.5.3.tar.gz | tar -xz -C /opt/

ENV PATH="/root/.jenv/shims:/opt/jenv-0.5.3/bin:$PATH"

RUN mkdir -p /root/.jenv/versions/ && echo 'eval "$(jenv init -)"' >>  /etc/bash.bashrc
RUN jenv add /opt/jdk-11.0.8+10
RUN jenv add /opt/jdk8u265-b01

ARG JAVA_VERSION=
ENV JAVA_VERSION=${JAVA_VERSION}

RUN jenv global ${JAVA_VERSION} 
RUN java -version