unsupport configs filed

### What is the problem you're trying to solve

docker-compose.yaml
configs:
create_db_sql:
content: |
CREATE DATABASE kuboard DEFAULT CHARACTER SET = 'utf8mb4' DEFAULT COLLATE = 'utf8mb4_unicode_ci';
create user 'kuboard'@'%' identified by 'kuboardpwd';
grant all privileges on kuboard.* to 'kuboard'@'%';
FLUSH PRIVILEGES;

services:
db:
image: swr.cn-east-2.myhuaweicloud.com/kuboard/mariadb:11.3.2-jammy
environment:
MARIADB_ROOT_PASSWORD: kuboardpwd
MYSQL_ROOT_PASSWORD: kuboardpwd
TZ: Asia/Shanghai
volumes:
- ./kuboard-mariadb-data:/var/lib/mysql:Z
configs:
- source: create_db_sql
target: /docker-entrypoint-initdb.d/create_db.sql
mode: 0777
networks:
kuboard_v4_dev:
aliases:
- db
kuboard:
image: swr.cn-east-2.myhuaweicloud.com/kuboard/kuboard:v4
environment:
- DB_DRIVER=org.mariadb.jdbc.Driver
- DB_URL=jdbc:mariadb://db:3306/kuboard?serverTimezone=Asia/Shanghai
- DB_USERNAME=kuboard
- DB_PASSWORD=kuboardpwd
ports:
- '8000:80'
depends_on:
- db
networks:
kuboard_v4_dev:
aliases:
- kuboard

networks:
kuboard_v4_dev:
driver: bridge

[root@master01 v4]# ./nerdctl/bin/nerdctl compose -f docker-compose.yaml up
WARN[0000] Ignoring: config create_db_sql: [Content]
FATA[0000] config "create_db_sql": lacks file path
You have new mail in /var/spool/mail/root
[root@master01 v4]# ./nerdctl/bin/nerdctl --version
nerdctl version 2.0.0-beta.5
You have new mail in /var/spool/mail/root

### Describe the solution you'd like

want nertctl to support docker-compose.yaml like above file

### Additional context

_No response_