更新k8s公有镜像

[yuxiaoba]

构建镜像有些慢，而且容易出错，因而commit 已经跑通的 k8s 公有镜像地址

[CLAassistant]

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[CarpenterLee]

多谢贡献，使用过程中有遇到什么问题吗？欢迎建议。

Thanks for your contribution. Do you have any questions about the benchmark model?

[yuxiaoba]

workload generator的代码没有任何注释，不是很懂它的产生规则