Add: Dockerfile, readme.md

Dockerfile

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+FROM --platform=${TARGETPLATFORM} alpine:latest
+ARG TARGETPLATFORM
+
+RUN mkdir /lib64 && \
+    ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2 && \
+    sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+
+CMD /bin/sh

README.md

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+# Eigeen's Alpine
+
+## Features
+
+- Run binaries directly (Such as binaries compiled by golang).
+- Use mirror.aliyun.com to speed up `apk` command.