Build for windows/386 platform produce an "is not valid win32 application" error

Hi to all!

I have a problem with windows/386 out file: "gitlab-ci-multi-runner-windows-386.exe is not valid win32 application". Here is my steps on a machine with Ubuntu 16.04:

apt update
apt install docker.io
apt install golang-go
export GOPATH=/home/{username}/gocode
cd $GOPATH/src
mkdir gitlab.com && cd gitlab.com
mkdir gitlab-org && cd gitlab-org
git clone https://gitlab.com/gitlab-org/gitlab-ci-multi-runner.git
cd gitlab-ci-multi-runner
make deps
cp -a $GOPATH/bin/. /usr/sbin/
make build