spring-boot 官方推荐的 docker 镜像制作方式（利用缓存，高效构建，减少磁盘存储）

Dockerfile：

FROM eclipse-temurin:8-jre as builder
WORKDIR application
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} application.jar
RUN java -Djarmode=layertools -jar application.jar extract

FROM eclipse-temurin:8-jre
WORKDIR application
COPY --from=builder application/dependencies/ ./
COPY --from=builder application/spring-boot-loader/ ./
COPY --from=builder application/snapshot-dependencies/ ./
COPY --from=builder application/application/ ./
CMD ["java", "org.springframework.boot.loader.JarLauncher"]

适用于 spring-boot 2.7.x，官方文档（2.7.18）：https://docs.spring.io/spring-boot/docs/2.7.18/reference/html/container-images.html#container-images.dockerfiles