fix: clean buildx caches and dangling builder volumes in mintel-optimizer

packages/infra/scripts/mintel-optimizer.sh

@@ -56,7 +56,17 @@ fi
 # 3. Global Docker Pruning
 echo "🧹 Pruning Docker resources..."
 docker system prune -af --filter "until=24h"
+
+echo "🧹 Pruning BuildKit builder containers and cache..."
+# Remove orphaned buildkit containers to release volume locks
+docker rm -f $(docker ps -aq --filter name=buildx_buildkit_builder) 2>/dev/null || true
+docker builder prune -af || true
+docker buildx prune -af || true
+
+echo "🧹 Pruning Docker volumes..."
 docker volume prune -f
+# Force remove dangling buildx state volumes that might bypass standard prune
+docker volume ls -q | grep buildx | xargs -r docker volume rm 2>/dev/null || true
 
 echo "✅ Optimization complete!"
 df -h /mnt/HC_Volume_104796416