а решение-то было максимально простым) Спасибо большое!
FROM maven:3-jdk-8-alpine as builder
WORKDIR /usr/src/app
COPY pom.xml /usr/src/app
RUN mvn dependency:go-offline
COPY . /usr/src/app
RUN mvn package -B
RUN ls -l target
FROM openjdk:8-jre-alpine
ENV JAVA_OPTS="" \
JAVA_HEAP="-Xmx256m -Xms256m" \
JAVA_GC="-XX:+UseG1GC" \
PORT=9000
WORKDIR /app
COPY --from=builder /usr/src/app/target/*.jar /app/app.jar
CMD ["sh", "-c", "java $JAVA_OPTS $JAVA_HEAP $JAVA_GC -jar app.jar"]
# HEALTHCHECK --interval=5s --timeout=3s --retries=5 CMD curl -f http://localhost:${PORT}/ || exit 1