chore: add prepack step

Author: danielroe

package.json

@@ -27,6 +27,7 @@
     "build": "unbuild",
     "dev": "vitest",
     "lint": "eslint src",
+    "prepack": "unbuild",
     "release": "pnpm test && pnpm build && changelogen --release --push && pnpm publish",
     "test": "pnpm lint && pnpm vitest run --coverage && tsc --noEmit"
   },