Update HomeController.java

src/main/java/de/codecentric/springbootsample/HomeController.java

@@ -42,6 +42,9 @@ public class HomeController {
         List<Record> records = repository.findAll();
         model.addAttribute("records", records);
         model.addAttribute("insertRecord", new Record());
+        
+        String myEnv = System.getenv("AMBIENTE");
+        model.addAttribute("ambiente", myEnv);
         return "home";
     }