update Dockerfile

Dockerfile

 FROM eclipse-temurin:19-jdk-alpine
+WORKDIR /app
+COPY . .
+RUN apk add maven
+RUN mvn clean install
 VOLUME /tmp
 COPY target/*.jar app.jar
-ENTRYPOINT ["java","-jar","/app.jar"]
+ENTRYPOINT ["java","-jar","/app/app.jar"]
 EXPOSE 8080