FROM gradle:jdk11 as builder COPY --chown=gradle:gradle . /home/gradle/src WORKDIR /home/gradle/src RUN gradle build FROM openjdk:11-jre-slim COPY --from=builder /home/gradle/src/build/distributions/watchtower.tar /app/watchtower.tar WORKDIR /app RUN tar -xvf watchtower.tar WORKDIR /app/watchtower CMD bin/watchtower