ci: add vercel check deploy branch script

.github/check_deploy_branch.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+git diff HEAD^ HEAD --quiet .
+
+if [[ "$VERCEL_GIT_COMMIT_REF" == "main" && $? -eq 1 ]]; then
+	# Proceed with the build
+	echo "✅ - Proceed"
+	exit 1;
+else
+	# Don't build
+	echo "🛑 - Build cancelled"
+	exit 0;
+fi