Reuse the existing 'build' script

Author: timngyn

package.json

@@ -133,7 +133,7 @@
     "spellcheck": "cspell \"src/**/*.mdx\" --no-progress",
     "spellcheck-diff": "git diff --name-only --cached | awk \"/src.*\\.mdx/{print}\" | npx cspell --no-must-find-files --file-list stdin",
     "build": "node tasks/generate-sitemap.mjs && next build && next export -o client/www/next-build",
-    "build:release": "node tasks/generate-sitemap.mjs && next build && next export -o client/www/next-build && next-image-export-optimizer --exportFolderPath client/www/next-build",
+    "build:release": "yarn build && next-image-export-optimizer --exportFolderPath client/www/next-build",
     "next-build": "next build",
     "next-start": "next start",
     "prepare": "husky install"