add linux static target

build_static.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+# many thanks to @negbie
+# https://github.com/google/gopacket/issues/424#issuecomment-369551841
+set -ex
+apk update
+apk add linux-headers musl-dev gcc go libpcap-dev ca-certificates git
+
+mkdir /go
+export GOPATH=/go
+mkdir -p /go/src/github.com/emmaunel
+mkdir -p /mnt/out
+cp -a /mnt /go/src/github.com/emmaunel/vishnu
+cd /go/src/github.com/emmaunel/vishnu
+rm -f vishnu*
+go get -v ./ ./
+go build --ldflags '-linkmode external -extldflags "-static -s -w"' -v ./
+cp ./vishnu /mnt/out/