docs: add README for prefect-worker-pg-backup image

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# Prefect Worker - PostgreSQL Backup
Image Docker pour un worker Prefect dédié aux sauvegardes de bases de données PostgreSQL vers un stockage S3-compatible (Garage).
## Contenu
- **Base** : `prefecthq/prefect:3-python3.12`
- **Outils PostgreSQL** : `pg_dump`, `pg_restore`, `psql`
- **Python** : `boto3`, `psycopg2-binary`
## Utilisation
### Dans docker-compose
```yaml
prefect-worker:
image: gitea.arnodo.fr/damien/prefect-worker-pg-backup:latest
environment:
- PREFECT_API_URL=http://prefect-server:4200/api
command: prefect worker start --pool pg-backup-pool --type process
depends_on:
- prefect-server
```
### Variables d'environnement requises pour les flows
| Variable | Description |
|----------|-------------|
| `PREFECT_API_URL` | URL de l'API Prefect |
| `AWS_ACCESS_KEY_ID` | Clé d'accès S3 (Garage) |
| `AWS_SECRET_ACCESS_KEY` | Secret S3 (Garage) |
| `AWS_ENDPOINT_URL` | Endpoint S3 (ex: `https://s3.garage.example.com`) |
## Build local
```bash
docker build -t prefect-worker-pg-backup:latest images/prefect-worker-pg-backup/
```