User Spring layers in dockerfile

[simplyRoba]

Faster startup

https://spring.io/guides/topicals/spring-boot-docker/#a-better-dockerfile
https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#container-images.dockerfiles

FROM eclipse-temurin:17-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:17-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/ ./
ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]