Update ci_post_clone.sh

apps/box/ios/ci_scripts/ci_post_clone.sh

@@ -3,13 +3,16 @@
 set -e
 
 # Install Node.js
-NODE_VERSION=16
+NODE_VERSION=18
 curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash
 export NVM_DIR="$HOME/.nvm"
 [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
 nvm install $NODE_VERSION
 nvm use $NODE_VERSION
 
+# Install Yarn
+npm install -g yarn
+
 # Install CocoaPods
 brew install cocoapods
 
@@ -32,6 +35,7 @@ pod install
 # Return to the project root
 cd /Volumes/workspace/repository
 
-# Print Node.js and npm versions for debugging
+# Print Node.js, npm, and Yarn versions for debugging
 node --version
-npm --version
+npm --version
+yarn --version