ci: build local sans registry, pattern sejeteralo

- Suppression write-docker-creds et secrets docker_registry/username/password
- build-backend/frontend : docker build local sur sonic (docker.sock)
- sbom-generate : scan des images locales via docker.sock
- docker-compose.yml : ajout image: libredecision-{backend,frontend}:latest
- deploy : suppression docker compose pull (images locales)

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

docker/docker-compose.yml

@@ -20,6 +20,7 @@ services:
       - libredecision
 
   backend:
+    image: libredecision-backend:latest
     build:
       context: ../
       dockerfile: docker/backend.Dockerfile
@@ -47,6 +48,7 @@ services:
       - traefik
 
   frontend:
+    image: libredecision-frontend:latest
     build:
       context: ../
       dockerfile: docker/frontend.Dockerfile