[Show and tell] helm chart support

[incubator4]

What feature is it?

Use helm chart to deploy RSS Hub in kubernetes
使用helm chart的方式部署在k8s集群中

What problem does this feature solve?

Nothing
无

Additional description

This is my repo for helm chart
For now， memory and redis cache supported, and redis subchart.
Document is not completed now.

这是我自己写的chart
目前支持通过环境变量启用redis或者memory，并且配有redis子chart
文档目前还没有完善

[github-actions]

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[TonyRL]

Please convert this to discussion “Show and tell”.