Fix Docker deployment - use built image instead of building locally

- Change docker-compose.prod.yml to use ghcr.io image instead of building
- Add --force-recreate flag to ensure new container is created
- Add docker image prune to remove old images
- This should fix the issue where old container version is served

.github/workflows/ci-cd.yml

@@ -190,8 +190,11 @@ jobs:
           # Stop and remove old container
           docker compose -f $COMPOSE_FILE down || true
           
-          # Start new container
-          docker compose -f $COMPOSE_FILE up -d
+          # Remove old images to force using new one
+          docker image prune -f
+          
+          # Start new container with force recreate
+          docker compose -f $COMPOSE_FILE up -d --force-recreate
           
           # Wait for health check
           echo "Waiting for application to be healthy..."