fix: embedding upload error (#38439)

Markdown processing for uploads now depends on the 'common' package (for
feature flag querying). Added it to the GitHub Workflow to make sure
it is accessible during that step. (Actually added the whole packages
directory since it seems likely that we might need other stuff from this
in the future.)

.github/workflows/search.yml

@@ -46,6 +46,7 @@ jobs:
             apps/docs
             apps/www/.env.local.example
             examples
+            packages
             supabase
 
       - uses: pnpm/action-setup@v4