add todo

Author: nemanjam

docs/working-notes/todo4.md

@@ -204,3 +204,11 @@ PLAUSIBLE_DOMAIN: 'nemanjamitic.com'
 ```
 
 git checkout refactor/migrate-to-pnpm
+
+git checkout -b feature/runtime-env-vars
+
+problem:
+SITE_URL is used in static pages at build time
+feed, sitemap, static pages, must be generated at build time.
+only possible for content generated with js <script />
+