chore: JwtService 인증 허가 메소드 소셜 로그인 분기 처리 username 변경 (#29)

src/main/java/com/pawwithu/connectdog/jwt/service/JwtService.java

@@ -302,7 +302,7 @@ public void saveVolunteerAuthentication(Volunteer volunteer) {
             password = PasswordUtil.generateRandomPassword();
 
             userDetailsUser = org.springframework.security.core.userdetails.User.builder()
-                    .username(volunteer.getId() + volunteer.getRole().toString())
+                    .username(volunteer.getSocialId())
                     .password(password)
                     .roles(volunteer.getRole().name())
                     .build();