Upgrading 5.x to 6.x

• deployment: the inventory configuration needs to be adjusted. An example commit with these changes can be seen in the demo hosting repository.
• copy the declaration of leihs_external_hostname from settings/yourhost.yml to host_vars/yourhost.yml file for this host.
• make sure the leihs_external_hostname host_vars/yourhost.yml defines the correct external hostname, with no scheme, e.g. leihs_external_hostname: "leihs.example.org"
• make sure that all the other values in config/settings.yml are saved into the settings (see in DB or Admin UI). This will be the case if you have not changed the settings since the last deploy.
• remove the folder settings