add tool download for m1

Author: umbynos

tools/download.go

@@ -67,7 +67,8 @@ type index struct {
 var systems = map[string]string{
 	"linuxamd64":   "x86_64-linux-gnu",
 	"linux386":     "i686-linux-gnu",
-	"darwinamd64":  "apple-darwin",
+	"darwinamd64":  "i686-apple-darwin",
+	"darwinarm64":  "arm64-apple-darwin",
 	"windows386":   "i686-mingw32",
 	"windowsamd64": "i686-mingw32",
 	"linuxarm":     "arm-linux-gnueabihf",

tools/download_test.go

@@ -38,6 +38,7 @@ func TestDownloadCorrectPlatform(t *testing.T) {
 		{"linux", "amd64", "x86_64-linux-gnu"},
 		{"linux", "386", "i686-linux-gnu"},
 		{"darwin", "amd64", "x86_64-apple-darwin"},
+		{"darwin", "arm64", "arm64-apple-darwin"},
 		{"windows", "386", "i686-mingw32"},
 		{"windows", "amd64", "i686-mingw32"},
 		{"linux", "arm", "arm-linux-gnueabihf"},