feat: Implement /setup-github command (#5069)

packages/cli/src/utils/gitUtils.ts

@@ -0,0 +1,26 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { execSync } from 'child_process';
+
+/**
+ * Checks if a directory is within a git repository hosted on GitHub.
+ * @returns true if the directory is in a git repository with a github.com remote, false otherwise
+ */
+export function isGitHubRepository(): boolean {
+  try {
+    const remotes = execSync('git remote -v', {
+      encoding: 'utf-8',
+    });
+
+    const pattern = /github\.com/;
+
+    return pattern.test(remotes);
+  } catch (_error) {
+    // If any filesystem error occurs, assume not a git repo
+    return false;
+  }
+}