chore: update .env.example to include missing placeholders SUPABASE_SERVICE_ROLE_KEY and SUPABASE_URL

Author: alexmarqs

apps/web/.env.example

@@ -3,4 +3,6 @@ NEXT_PUBLIC_POSTHOG_KEY=
 NEXT_PUBLIC_POSTHOG_HOST=
 NEXT_PUBLIC_SUPABASE_URL=
 # Make sure to enable RLS and policies to use this key in client
-NEXT_PUBLIC_SUPABASE_ANON_KEY=
+NEXT_PUBLIC_SUPABASE_ANON_KEY=
+SUPABASE_SERVICE_ROLE_KEY=
+SUPABASE_URL=