🐳 Lightweight dockerfiles (#53)

docker-images/README.md

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+## Docker images
+
+Here you find useful and lightweight Dockerfiles. 
+
+Furthermore, there is also a `release-example.sh` file that will guide you through on how to release your Docker image to any desired registry.

docker-images/jdk11-mvn3.6.3.Dockerfile

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+FROM alpine:3.11
+
+ENV JAVA_VERSION="11.0.5_p10-r0"
+ENV MAVEN_VERSION="3.6.3-r0"
+
+ENV JAVA_HOME /usr/lib/jvm/java-11-openjdk
+ENV PATH $PATH:/usr/lib/jvm/java-11-openjdk/jre/bin:/usr/lib/jvm/java-11-openjdk/bin
+
+RUN set -x \
+    && apk update \
+    && apk add --no-cache \
+        openjdk11="${JAVA_VERSION}" \
+        maven \
+    && rm -rf /var/cache/* \
+    && rm -rf /root/.cache/*
+
+CMD ["/bin/sh"]

docker-images/jdk11.Dockerfile

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+FROM alpine:3.11
+
+ENV JAVA_VERSION="11.0.5_p10-r0"
+
+ENV JAVA_HOME /usr/lib/jvm/java-11-openjdk
+ENV PATH $PATH:/usr/lib/jvm/java-11-openjdk/jre/bin:/usr/lib/jvm/java-11-openjdk/bin
+
+RUN set -x \
+    && apk update \
+    && apk add --no-cache \
+        openjdk11="${JAVA_VERSION}" \
+    && rm -rf /var/cache/* \
+    && rm -rf /root/.cache/*
+
+CMD ["/bin/sh"]

docker-images/python3.Dockerfile

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+FROM alpine:3.11
+
+RUN set -x \
+    && apk update \
+    && apk add --no-cache \
+        python3 \
+    && pip3 install --no-cache-dir --upgrade pip \
+    && rm -rf /var/cache/* \
+    && rm -rf /root/.cache/*
+
+CMD ["/bin/sh"]

docker-images/release-example.sh

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+#!/usr/bin/env bash
+set -eo pipefail
+
+DOCKERFILE=jdk11.Dockerfile
+DOCKER_REGISTRY=docker.io
+DOCKER_IMAGE=${DOCKER_REGISTRY}/<your-docker-hub-user-name>/<your-image-name>
+DOCKER_TAG=1.0.0
+
+## LOGIN
+echo 'Logging into docker hub'
+echo "${DOCKER_PASSWORD}" | docker login -u "${DOCKER_USERNAME}" --password-stdin
+
+## BUILD IMAGE
+echo 'Building docker image'
+docker build -t ${DOCKER_IMAGE}:${DOCKER_TAG} -f ${DOCKERFILE} .
+
+## TAG IMAGE
+echo 'Tagging image'
+docker tag ${DOCKER_IMAGE}:${DOCKER_TAG} ${DOCKER_IMAGE}:latest
+
+## UPLOAD IMAGE
+echo 'Uploading image'
+docker push ${DOCKER_IMAGE}:${DOCKER_TAG}
+docker push ${DOCKER_IMAGE}:latest
+
+## CLEAR WORKSPACE
+echo 'Clearing workspace'
+docker rmi ${DOCKER_IMAGE}:${DOCKER_TAG}
+docker rmi ${DOCKER_IMAGE}:latest