Dockerfile

FROM ubuntu:25.04

# Bake a container using sdkman to get all the needed JDKs.
ARG USER_UID="1100"
ARG USER_GID="1100"
ARG USER_NAME="jenkins"

RUN groupadd -g $USER_GID $USER_NAME && \
	useradd -m -g $USER_GID -u $USER_UID $USER_NAME

COPY java-init.sh /home/jenkins/java-init.sh
COPY java-tools.properties /home/jenkins/java-tools.properties

RUN set -eux; \
	chown $USER_UID:$USER_GID /home/jenkins && \
	chown -R $USER_UID:$USER_GID /home/jenkins/* && \
	touch /etc/apt/apt.conf.d/99verify-peer.conf && \
	echo >>/etc/apt/apt.conf.d/99verify-peer.conf "Acquire { https::Verify-Peer false }" && \
	sed -i -e 's/archive.ubuntu.com/atl.mirrors.clouvider.net\/ubuntu/g' /etc/apt/sources.list && \
	sed -i -e 's/security.ubuntu.com/atl.mirrors.clouvider.net\/ubuntu/g' /etc/apt/sources.list && \
	sed -i -e 's/ports.ubuntu.com/ftp.tu-chemnitz.de\/pub\/linux/g' /etc/apt/sources.list && \
	sed -i -e 's/http/https/g' /etc/apt/sources.list && \
	apt-get update &&  \
	apt-get -y install curl zip gnupg gnupg1 libfreetype6 fontconfig wget git && \
	rm -rf /var/lib/apt/lists/* &&  \
	rm -rf /tmp/*

USER $USER_UID:$USER_GID

RUN curl -s "https://get.sdkman.io" | bash

RUN bash -c "cd /home/jenkins && \
	chmod a+x /home/jenkins/java-init.sh && \
	./java-init.sh && \
	rm -rf /home/jenkins/.sdkman/archives/* && \
	rm -rf /home/jenkins/.sdkman/tmp/*"

ENV MAVEN_HOME="/home/jenkins/.sdkman/candidates/maven/current"
ENV JAVA_HOME="/home/jenkins/.sdkman/candidates/java/current"
ENV PATH="$MAVEN_HOME/bin:$JAVA_HOME/bin:$PATH"