ci: add jest.config.js to scope test runner to __tests__/

Signed-off-by: Mounil Kanakhara <mounilkankhara@gmail.com>

Author: Mounil2005

.github/scripts/jest.config.js

@@ -0,0 +1,4 @@
+/** @type {import('jest').Config} */
+module.exports = {
+    testMatch: ["**/__tests__/**/*.test.js"],
+};