Generate a pre-signed URL that allows direct file uploads to NoCloud storage. This is useful for client-side uploads where you don’t want to proxy files through your server.
Query parameters are optional. Provide them only if you want to pre-allocate storage for the file. If omitted, a non-allocated signed URL is generated instead.
The pre-signed URL for uploading. Upload to this URL using a POST request
with the file as form data. You can optionally include a metadata field in
the form data.