Fix download command with Apple Silicon machines

Signed-off-by: Zespre Schmidt <starbops@zespre.com>

Author: starbops

cmd/download.go

@@ -226,7 +226,11 @@ func buildFilename(arch, osVal string) (string, string) {
 	}
 
 	if osVal == "darwin" {
-		arch = "-" + osVal
+		if arch == "arm64" {
+			arch = "-" + osVal + "-" + arch
+		} else {
+			arch = "-" + osVal
+		}
 	} else if arch == "amd64" {
 		arch = ""
 	} else {

cmd/download_test.go

@@ -46,3 +46,12 @@ func Test_BuildFilename_Darwin_amd64(t *testing.T) {
 		t.Errorf("want: %s, but got: %s", want, arch+ext)
 	}
 }
+
+func Test_BuildFilename_Darwin_arm64(t *testing.T) {
+	arch, ext := buildFilename("arm64", "darwin")
+	want := "-darwin-arm64"
+
+	if want != arch+ext {
+		t.Errorf("want: %s, but got: %s", want, arch+ext)
+	}
+}