Add script to build separate binary artifact

build.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -ex
+
+npm=$(buildah from node:12)
+npm_run="buildah run --volume=${PWD}/ui:/ui $npm"
+buildah config --workingdir=/ui $npm
+$npm_run npm install
+$npm_run npm run build
+buildah umount $npm
+
+go=$(buildah from golang:1.13.1)
+go_run="buildah run --volume=${PWD}:/wg --volume=${HOME}/.cache:/.cache ${go}"
+
+buildah config --workingdir=/wg $go
+$go_run go get github.com/go-bindata/go-bindata/...
+$go_run go get github.com/elazarl/go-bindata-assetfs/...
+$go_run go mod download
+$go_run go-bindata-assetfs -prefix ui/dist ui/dist
+$go_run go build .
+buildah umount $go
+
+dist=$(buildah from --format=docker gcr.io/distroless/base)
+buildah config --entrypoint=/wireguard-ui $dist
+buildah copy $dist wireguard-ui /
+buildah commit $dist embarkstudios/wireguard-ui:latest
+buildah umount $dist