use runtime package to get GOOS and GOARCH

main.go

@@ -6,6 +6,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"runtime"
 
 	"github.com/jesseduffield/lazygit/pkg/app"
 	"github.com/jesseduffield/lazygit/pkg/config"
@@ -15,9 +16,6 @@ var (
 	commit  string
 	version = "unversioned"
 	date    string
-	goos    string
-	arch    string
-	arm     string
 
 	debuggingFlag = flag.Bool("debug", false, "a boolean")
 	versionFlag   = flag.Bool("v", false, "Print the current version")
@@ -46,7 +44,7 @@ func main() {
 		version = fallbackVersion()
 	}
 	if *versionFlag {
-		fmt.Printf("commit=%s, build date=%s, version=%s, os=%s, arch=%s, arm=%s\n", commit, date, version, goos, arch, arm)
+		fmt.Printf("commit=%s, build date=%s, version=%s, os=%s, arch=%s\n", commit, date, version, runtime.GOOS, runtime.GOARCH)
 		os.Exit(0)
 	}
 	appConfig, err := config.NewAppConfig("lazygit", version, commit, date, debuggingFlag)