Add ubuntu20.04 compile dockerfile #226
                
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Hi @SF-Zhou SF 您好
1.在Ubuntu 20.04编译,安装依赖包时,在默认安装源无法clang-format-14 clang-14 clang-tidy-14 lld-14,gcc-10 g++-10 需要额外增加安装源
2.Ubuntu 20.04默认安装源在线安装时Rust工具链时,安装的版本时1.75.0,但是这个版本编译的时候会报错,更新了一下版本才通过
为了快速构建3FS,因此我编写了ubuntu20.04的dockerfile,里面自动安装依赖包以及需要的工具,我用该dockerfile制作的构建镜像已经编译通过,请帮忙看看是否可以合并,谢谢。