Uploading empty file: Permission denied

I started transfer.sh in a container with this arguments: `--provider=local`, `--basedir=/data/`

When I upload an empty file, I got this error:

```http
HTTP/2 500
content-type: text/plain; charset=utf-8
server: Transfer.sh HTTP Server
x-content-type-options: nosniff
x-made-with: <3 by DutchCoders
x-served-by: Proudly served by DutchCoders
date: Tue, 06 Feb 2024 20:50:00 GMT
content-length: 49

open /tmp/transfer-4122496938: permission denied
```

Same message appears in log.

Tested with this command:

`curl -sST /dev/null -i http://localhost/null`

Image used: `dutchcoders/transfer.sh:latest-noroot`

Image ID: `4d51e3998a08`