Docker container stuck in restart loop on first-time docker-compose up

### Describe the bug
When running `docker-compose up` for the first time using the default `docker-compose.yml`, the `wallabag` container enters a restart loop and never becomes healthy.

### To Reproduce
Steps to reproduce the behavior:
1. Clone the repo
2. Run `docker-compose up -d`
3. Check `docker ps` and logs: `docker-compose logs -f wallabag`

### Logs Snippet
wallabag_1 | Migrating database...
wallabag_1 | Doctrine\DBAL\Exception\ConnectionException: An exception occurred in driver: SQLSTATE[HY000] [2002] Connection refused
wallabag_1 | Retrying in 5 seconds...

### Expected behavior
The container should wait until the `mysql` container is ready or fail with a clearer error if dependencies aren't available.

### Environment
- OS: Ubuntu 22.04
- Docker: 24.0.2
- Docker Compose: 2.18.1
- Branch: main
- Wallabag Version: latest

### Workaround
Manually restarting the container after 30 seconds works, but not ideal for CI/CD.

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Let me know if you want a second one with a different issue (e.g., volume persistence or networking).