Static slirp build

Dockerfile

# syntax=docker/dockerfile:1.4
# DOCKER_BUILDKIT=1 docker build -t tag .
FROM debian:latest AS build

MAINTAINER haohaolee <[email protected]>

WORKDIR /root

RUN <<eot bash
    apt update
    apt install -y musl-dev musl-tools cdbs wget dpkg-dev devscripts
    wget http://deb.debian.org/debian/pool/main/s/slirp/slirp_1.0.17.orig.tar.gz
    wget http://deb.debian.org/debian/pool/main/s/slirp/slirp_1.0.17-11.debian.tar.xz
    tar xf slirp_1.0.17.orig.tar.gz
    cd slirp-1.0.17
    tar xf ../slirp_1.0.17-11.debian.tar.xz
    debuild --set-envvar CC="musl-gcc -static -D__P\(x\)=x" -b -uc -us
eot
# Binary is at `slirp-1.0.17/src/slirp-fullbolt`