install sam2 the way facebook says

runpod_setup.sh

@@ -36,13 +36,11 @@ if [ ! -d "segment-anything-2" ]; then
 fi
 
 # Download SAM2 checkpoints using their official script
-cd segment-anything-2
-mkdir -p checkpoints
-cd checkpoints
+cd segment-anything-2/checkpoints
 if [ ! -f "sam2.1_hiera_large.pt" ]; then
     echo "📥 Downloading SAM2 checkpoints..."
-    chmod +x ../download_ckpts.sh 2>/dev/null || true
-    bash ../download_ckpts.sh || bash <(curl -s https://raw.githubusercontent.com/facebookresearch/segment-anything-2/main/download_ckpts.sh)
+    chmod +x download_ckpts.sh
+    bash download_ckpts.sh
 fi
 cd ../..