安装命令：
apk add gcc libffi-dev musl-dev openssl-dev python3-dev && pip3 install bs4 cryptography~=3.2.1 json5 requests rsa
错误提示：
ERROR: http://mirrors.aliyun.com/alpine/v3.11/main: Permission denied
WARNING: Ignoring http://mirrors.aliyun.com/alpine/v3.11/main: No such file or directory
fetch http://mirrors.aliyun.com/alpine/v3.11/community/aarch64/APKINDEX.tar.gz
ERROR: http://mirrors.aliyun.com/alpine/v3.11/community: Permission denied
WARNING: Ignoring http://mirrors.aliyun.com/alpine/v3.11/community: No such file or directory
ERROR: unable to select packages:
freetype-dev (no such package):
required by: world[freetype-dev]
gcc (no such package):
required by: world[gcc]
jpeg-dev (no such package):
required by: world[jpeg-dev]
libffi-dev (no such package):
required by: world[libffi-dev]
musl-dev (no such package):
required by: world[musl-dev]
openssl-dev (no such package):
required by: world[openssl-dev]
python3-dev (no such package):
required by: world[python3-dev]
zlib-dev (no such package):
required by: world[zlib-dev]
解决办法：
全局用楼梯。