refactor: clean up github and rewrite its auth

packages/backend/src/apps/github/common/get-current-user.ts

@@ -0,0 +1,14 @@
+import { IGlobalVariable, IJSONObject } from '@automatisch/types';
+import generateRequest from './generate-request';
+
+const getCurrentUser = async ($: IGlobalVariable): Promise<IJSONObject> => {
+  const response = await generateRequest($, {
+    requestPath: '/user',
+    method: 'GET',
+  });
+
+  const currentUser = response.data;
+  return currentUser;
+};
+
+export default getCurrentUser;