静态编译以支持musl

[zenlei]

在alpine试了下没跑起来， ldd onesend 看了下应该是没静态编译，建议编译的时候 export CGO_ENABLED=0

host:~/XXX# ldd onesend
	/lib64/ld-linux-x86-64.so.2 (0x7fc8df71a000)
	libpthread.so.0 => /lib64/ld-linux-x86-64.so.2 (0x7fc8df71a000)
	libc.so.6 => /lib64/ld-linux-x86-64.so.2 (0x7fc8df71a000)
Error relocating onesend: __vfprintf_chk: symbol not found
Error relocating onesend: __fprintf_chk: symbol not found

PS: fork 了下 Actions 卡住了,建议 runs-on: ubuntu-latest 改成 runs-on: ubuntu-20.04 指定下系统版本，不然有可能卡住

[yuudi]

感谢反馈