optimize vercel checkout

Author: avivkeller

scripts/vercel-prepare.sh

@@ -1,5 +1,11 @@
-# Clone nodejs/node to ./node
-git clone https://github.com/nodejs/node.git --depth 1 node
+# Clone the repository with no checkout and shallow history
+git clone --depth 1 --filter=blob:none --sparse https://github.com/nodejs/node.git
+
+# Move into the cloned directory
+cd node
+
+# Enable sparse checkout and specify the folder
+git sparse-checkout set doc/
 
 # Install npm dependencies
 npm ci