[build cache] Fix a bug when the persistent-Next-cache-on-Vercel is n…

…ot initialised yet

...by creating the `.next/cache/` at the start of the prod build folder if it doesn't exist yet

package.json

@@ -8,7 +8,7 @@
         "dev": "next dev",
         "build": "next build",
         "build:prod": "npm run build:textualize-cache:display && npm run scripts:transpile && npm run scripts:generate-data-code-for-galleries && next build && npm run build:textualize-cache:display",
-        "build:textualize-cache:display": "cat .next/cache/textualize-cache.*.json || true",
+        "build:textualize-cache:display": "mkdir -p .next/cache/ && cat .next/cache/textualize-cache.*.json || true",
         "build:textualize-cache:clear": "rm -f .next/cache/textualize-cache.*.json || true",
         "start": "next start",
         "prepare": "husky install",