Dockerfile

################################################################################
# Build stage 0: builder
################################################################################
FROM maven:3-jdk-8 AS builder

WORKDIR /usr/src/app

COPY . .

RUN set -ex; \
    curl -sL https://deb.nodesource.com/setup_14.x | bash -;\
    apt-get install -y --no-install-recommends \
      nodejs; \
    node --version; \
    npm --version

RUN mvn clean --batch-mode package -Pproduction -DskipTests; \
    mv /usr/src/app/target/vaadin-demo-bakery-app-$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout).war \
        /usr/src/app/target/app.war

################################################################################
# Build stage 1: actual image
################################################################################
FROM openjdk:8-jre-slim

LABEL \
    maintainer="Igor Baiborodine <igor@kiroule.com>" \
    org.label-schema.schema-version="1.0" \
    org.label-schema.name="vaadin-demo-bakery-app" \
    org.label-schema.vcs-url="https://github.com/igor-baiborodine/vaadin-demo-bakery-app" \
    org.label-schema.usage="https://github.com/igor-baiborodine/vaadin-demo-bakery-app/blob/master/README.md"

ENV APP_HOME /opt/bakery
ENV APP_USER bakery
ENV APP_GROUP bakery

RUN groupadd ${APP_GROUP}; \
    useradd -g ${APP_GROUP} ${APP_USER}

RUN set -ex; \
    apt-get update; \
    apt-get install -y --no-install-recommends \
        # su tool for easy step-down from root
        gosu; \
    rm -rf /var/lib/apt/lists/*; \
    gosu nobody true

COPY --from=builder --chown=${APP_USER}:${APP_GROUP} /usr/src/app/target/app.war ${APP_HOME}/app.war
COPY docker-entrypoint.sh /usr/local/bin/

RUN chmod a+x /usr/local/bin/docker-entrypoint.sh

WORKDIR ${APP_HOME}
ENTRYPOINT ["docker-entrypoint.sh"]
EXPOSE 8080
CMD ["bash", "-c", "java -jar $APP_HOME/app.war"]