CI seed : corrige nom container (sans suffixe -1)

ehv-decision-main-backend, pas ehv-decision-main-backend-1.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.woodpecker.yml

@@ -202,7 +202,7 @@ steps:
     commands:
       - |
         PROJECT=$(grep '^COMPOSE_PROJECT_NAME=' /opt/libredecision/.env | cut -d= -f2)
-        docker exec "$PROJECT-backend-1" python seed.py
+        docker exec "$PROJECT-backend" python seed.py
         echo "Seed terminée"
 
   - name: healthcheck