docs: pnpm workaround

Author: fi3ework

netlify.toml

@@ -1,6 +1,7 @@
 [build.environment]
   NODE_VERSION = "18"
+  NPM_FLAGS = "--version" # prevent Netlify npm install
 [build]
   publish = "docs/.vitepress/dist"
-  command = "pnpm run docs:build"
+  command = "npx pnpm i --store=node_modules/.pnpm-store --frozen-lockfile && npm run docs:build"
   ignore = "git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF docs package.json pnpm-lock.yaml netlify.toml"