git clone https://github.com/keycloak/keycloak-gatekeeper
or
go get -u github.com/keycloak/keycloak-gatekeeper
GOOS=linux GOARCH=amd64 go build -o keycloak-gatekeeper-linux
GOOS=darwin GOARCH=amd64 go build -o keycloak-gatekeeper-darwin
GOOS=windows GOARCH=amd64 go build -o keycloak-gatekeeper-windows.exe