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[镜像请求] 增加 Armbian 扩展镜像和内核文件

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### 先决条件 (Prerequisites) - [X] 我已确认这个镜像源从未在 [其他 issues](https://github.com/tuna/issues) 中讨论过。 I am sure that this repo has NEVER been discussed in [other issues](https://github.com/tuna/issues). - [X] 我已确认这个镜像源没有我选择的镜像站上线。 I am sure that this...