### Description
Add the `--storage-path` flag to the installer to configure a custom
storage path out of the box.
On existing installation, we check that the 'storage.path' in the
configuration file is the same as the one provided by the installer.
This ensures that we don't update the nginx configuration file with an
invalid storage path.
Closes#2522
To reduce the strain on the API service, we moved the media file serving
to the Nginx web server. The API is still handling the authentication,
but delegates the serving using the `X-Accel-Redirect` header.
BREAKING CHANGE: The media file serving is now handled by Nginx instead
of the API service. The `storage.path` field is now used in the Nginx
configuration, so make sure to update the Nginx configuration file if
you change it.
BREAKING CHANGE: The `apache2` webserver has been replaced with `nginx` and `php-fpm`, be sure to uninstall `apache2` and clean related configuration files from your system before upgrading.
Jonas L
jo