Project release process

[sjmshsh]

Write some scripts for project release. For details, you can refer to Istio’s approach.

[chickenlj]

版本发布

• 发布 dubboctl，build 并上传（github action）
• 发布 dubbo 包，包含 dubboctl、dubbo-cp，conf/admin.yml 等，zip包上传 (github action)
• 发布 dubbo-cp 镜像包，上传到 registry
• 脚本支持下载 dubboctl、dubbo

[mfordjody]

The issue is outdated and needs to be re-planned.