Update pr template

[IcePigZDB]

What problem does this PR solve?

What have you done or changed in this PR?

What test did you complete before submitting the PR?

Above is the current PR template. In order to standardize the PR format, some fields can be added:

• Who participate in this PR？

[IcePigZDB]

也许可以增加一些github robot, app来完成一些类似 auto assign, auto add label, check title... 这些工作。发现两个相关示例：

• 直接安装github app，如基于probot的auto assign 这个是随机分配的。
• 另一种是搭建一个robot，如基于prow的tichi, prow部署教程。

[ZhiHanZ]

也许可以增加一些github robot, app来完成一些类似 auto assign, auto add label, check title... 这些工作。发现两个相关示例：

• 直接安装github app，如基于probot的auto assign 这个是随机分配的。
• 另一种是搭建一个robot，如基于prow的tichi, prow部署教程。

how about use github actions just like other OSS programs?

[IcePigZDB]

@ZhiHanZ thx, we will take a look at github actions.

[ZhiHanZ]

@ZhiHanZ thx, we will take a look at github actions.

great, I am maintaining github action based CI pipeline for https://github.com/datafuselabs/databend, and willing to contribute to issues in this repo if community needed