Use full path

Does upload-pages not take working-directory into account?

At the very least we got

> Run actions/upload-pages-artifact@v3
> Run echo ::group::Archive artifact
> Archive artifact
>   tar: build/: Cannot open: No such file or directory
>   tar: Error is not recoverable: exiting now
>   Error: Process completed with exit code 2.

Author: koppen

.github/workflows/parklife.yml

@@ -40,7 +40,7 @@ jobs:
       uses: actions/upload-pages-artifact@v3
       if: github.ref == 'refs/heads/main' # Only upload on main branch.
       with:
-        path: build/
+        path: demo/build/
 
   deploy:
     environment: