Merge pull request #72 from mju-likelion/feature/health-check-#71

Feature/#71 로드밸런서 health check 적용

src/main/java/org/mjulikelion/bagel/controller/HealthController.java

@@ -0,0 +1,12 @@
+package org.mjulikelion.bagel.controller;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HealthController {
+    @GetMapping("/health")
+    public String health() {
+        return "ok";
+    }
+}