Add a "build release" script

[dhermes]

This is what I did for the latest release. Fire up a "clean" build container with a volume to stash the built binaries:

mkdir release-builds
docker run \
  --rm \
  --interactive --tty \
  --volume $(pwd)/release-builds:/var/built \
  golang:1.18.2-alpine3.15

and then in the container install git and clone the repo

mkdir /var/code/
apk --update add git
git clone https://github.com/hardfinhq/npm-mod /var/code/npm-mod/

then to actually build in the container:

cd /var/code/npm-mod/
git checkout v1.20220526.1

CGO_ENABLED=0 GOOS=darwin  GOARCH=amd64 go build -ldflags="-s -w" -o /var/built/npm-mod-darwin-amd64-v1.20220526.1  ./cmd/npm-mod/
CGO_ENABLED=0 GOOS=darwin  GOARCH=arm64 go build -ldflags="-s -w" -o /var/built/npm-mod-darwin-arm64-v1.20220526.1  ./cmd/npm-mod/
CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags="-s -w" -o /var/built/npm-mod-windows-amd64-v1.20220526.1 ./cmd/npm-mod/
CGO_ENABLED=0 GOOS=windows GOARCH=arm64 go build -ldflags="-s -w" -o /var/built/npm-mod-windows-arm64-v1.20220526.1 ./cmd/npm-mod/
CGO_ENABLED=0 GOOS=linux   GOARCH=amd64 go build -ldflags="-s -w" -o /var/built/npm-mod-linux-amd64-v1.20220526.1   ./cmd/npm-mod/
CGO_ENABLED=0 GOOS=linux   GOARCH=arm64 go build -ldflags="-s -w" -o /var/built/npm-mod-linux-arm64-v1.20220526.1   ./cmd/npm-mod/