scripts() fix prepare script (install all deps)

scripts/prepare.sh

@@ -1,5 +1,5 @@
 # 1. Install all dependencies
-for D in integration/*; do [ -d "${D}" ] && npm i; done
+for D in integration/*/; do sh -c "cd ${D} && npm i"; done
 
 # 2. Build fresh packages and move them to sample and integration directories
 npm run build:dev &>/dev/null