Can't generate runnable jar according to user manual

[chpengzh]

Describe the bug

Could not create a runnable jar according to README manual

服务器端代码编译:

• all-in-one模式: ./boot/all-ine-one-bootstrap/build.sh 打包结果在boot/all-in-one-bootstrap/target/xxx-executable-ark.jar metrics-server: mvn clean install -DskipTests -am -pl boot/metrics-server-bootstrap gateway: mvn clean install -DskipTests -am -pl boot/gateway/bootstrap

Maybe a spring-boot-maven plugin should be declare to project's build configuration.

Expected behavior

Generate a runnable jar as artifact

Actual behavior

> java -jar boot/metrics-server-bootstrap/target/lookout-metrics-server-bootstrap-1.6.0.jar
boot/metrics-server-bootstrap/target/lookout-metrics-server-bootstrap-1.6.0.jar中没有主清单属性

Steps to reproduce

Build as manual

Minimal yet complete reproducer code (or GitHub URL to code)

Environment

• SOFALookout version: branch master
• JVM version (e.g. java -version): 1.8
• OS version (e.g. uname -a): none
• Maven version: 3.5.4
• IDE version: none