Dockerfile

ARG JDK_VERSION

FROM openjdk:$JDK_VERSION-jdk-slim-buster

# Env variables
ARG JDK_VERSION
ENV JDK_VERSION ${JDK_VERSION:-latest}

ARG DOCKER_VERSION
ARG DOCKER_COMPOSE_VERSION
ARG DOCKER_CONFIG
ENV DOCKER_VERSION ${DOCKER_VERSION:-24.0.6}
ENV DOCKER_COMPOSE_VERSION ${DOCKER_COMPOSE_VERSION:-2.21.0}
ENV DOCKER_CONFIG=${DOCKER_CONFIG:-/usr/local/lib/docker}

ARG KUBECTL_VERSION
ENV KUBECTL_VERSION ${KUBECTL_VERSION:-v1.26.3}

# Install build stuff
RUN set -eux; \
  apt-get update; \
  apt-get install -y --no-install-recommends curl

# Install Docker
RUN set -eux; \
  curl -L https://download.docker.com/linux/static/stable/x86_64/docker-$DOCKER_VERSION.tgz | tar xfzv - --strip-components 1 --directory /usr/local/bin/; \
  dockerd --version; \
  docker --version

# Install Docker Compose plugin
RUN set -eux; \
  mkdir -p $DOCKER_CONFIG/cli-plugins; \
  curl -L "https://github.com/docker/compose/releases/download/v$DOCKER_COMPOSE_VERSION/docker-compose-$(uname -s)-$(uname -m)" -o $DOCKER_CONFIG/cli-plugins/docker-compose; \
  chmod 755 $DOCKER_CONFIG/cli-plugins/docker-compose; \
  docker compose version

# Install GnuPG (for signing Maven Central artifacts)
RUN set -eux; \
  apt-get install -y --no-install-recommends gnupg

# Install kubectl and kustomize
RUN set -eux; \
  curl -LO "https://dl.k8s.io/release/$KUBECTL_VERSION/bin/linux/amd64/kubectl"; \
  curl -s "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh" | bash; \
  chmod 750 kubectl kustomize && mv kubectl kustomize bin/

# Clean up
RUN set -eux; \
  apt-get clean; \
  rm -f /usr/local/openjdk-$JDK_VERSION/src.zip