gogio: [MacOS] add MacOS .app compilation

This patch is a initial implementation to make
`.app` file. It supports custom icons and sign.

Signed-off-by: Inkeliz <inkeliz@inkeliz.com>

gogio/build_info.go

@@ -73,6 +73,8 @@ func getArchs() []string {
 			goarch = runtime.GOARCH
 		}
 		return []string{goarch}
+	case "macos":
+		return []string{"arm64", "amd64"}
 	default:
 		// TODO: Add flag tests.
 		panic("The target value has already been validated, this will never execute.")