добавил создание пользователя по умолчанию при первом старте

src/main/java/com/gipro/giprolab/GiprolabApplication.java

@@ -1,13 +1,30 @@
 package com.gipro.giprolab;
 
+import com.gipro.giprolab.models.UserDto;
+import com.gipro.giprolab.services.UserService;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.event.EventListener;
 
 @SpringBootApplication
 public class GiprolabApplication {
 
+    private final UserService userService;
+
+    public GiprolabApplication(UserService userService) {
+        this.userService = userService;
+    }
+
     public static void main(String[] args) {
         SpringApplication.run(GiprolabApplication.class, args);
     }
 
+    @EventListener(ApplicationReadyEvent.class)
+    public void doSomethingAfterStartup() {
+        if (userService.getUserByLogin("user@user.ru") == null) {
+            userService.createDefaultRoles();
+            userService.createUser(new UserDto("user@user.ru", "user"));
+        }
+    }
 }