$ go build -a -toolexec $(go env GOPATH)/bin/sqreen-instrumentation-tool my-project
$ GOFLAGS="-a -toolexec $(go env GOPATH)/bin/sqreen-instrumentation-tool"
$ go build my-project
$ go build -a -toolexec $(go env GOPATH)/bin/sqreen-instrumentation-tool my-project
$ GOFLAGS="-a -toolexec $(go env GOPATH)/bin/sqreen-instrumentation-tool"
$ go build my-project