How to correctly start a website using Git/Drush/Composer workflow?
Because my dev environment was Windows and the staging environment was Linux, the temporary folder differs.

I had to fix it using the admin pages of the file system.

Later I found that I will need to do this every time I use drush config-import so I decided to overwrite the value in settings.php as following:

$conf['file_temporary_path'] = '/tmp';