fix: check_metadata.sh + --update

scripts/check_metadata.sh

@@ -11,5 +11,9 @@ if cmp -s resources/new_metadata.scale resources/metadata.scale; then
     exit 0
 else
     echo "Metadata file needs to be generated. How to do it? $HOME/.cargo/bin/subxt metadata -f bytes > resources/metadata.scale"
+    if [ "$1" = "--update" ]; then
+      mv resources/new_metadata.scale resources/metadata.scale
+      echo "Metadata file updated automatically (--update option detected)"
+    fi
     exit 1
 fi