添加 构建SpringBoot2镜像.md

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```
FROM docker.1ms.run/library/mvn-java-8:latest
ENV PROJECT_ACTIVE=根据实际情况激活 application-xxx.yaml 配置文件比如prod
WORKDIR /app
EXPOSE springboot 内嵌的 servlet 容器端口号
# 配置容器启动命令
RUN << 'EOF' cat > /entrypoint.sh
#!/bin/bash
set -e
cd /app && rm -rf 源码目录
git clone "http://用户名:密码@远程仓库地址.git"
cd /app/源码目录 && mvn clean package
exec java -jar target/jar包名称.jar --spring.profiles.active=$PROJECT_ACTIVE
EOF
RUN chmod +x /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]
```