devops : healthCheck Controller add

Server healthCheck 를 위해서 Controller 추가하고 /health-check 엔드포인트에 OK 응답주는 API 추가했습니다.

backEnd/src/main/java/com/quiz/ourClass/global/server/HealthCheckController.java

@@ -0,0 +1,13 @@
+package com.quiz.ourClass.global.server;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HealthCheckController {
+
+    @GetMapping("/health-check")
+    public String healthCheck() {
+        return "OK";
+    }
+}