fix: update CI badge URL with branch parameter

Author: aqstack

README.md

@@ -1,6 +1,6 @@
 # Sentinel
 
-[![Build](https://github.com/aqstack/sentinel/actions/workflows/ci.yml/badge.svg)](https://github.com/aqstack/sentinel/actions/workflows/ci.yml)
+[![CI](https://github.com/aqstack/sentinel/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/aqstack/sentinel/actions/workflows/ci.yml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/aqstack/sentinel)](https://goreportcard.com/report/github.com/aqstack/sentinel)
 
 Predictive failure detection and autonomous orchestration for Kubernetes edge nodes.