Installation fails with custom nextcloud_installation_dir

[rapklein]

I have had the following issue with a custom nextcloud_installation_dir.
The role fails at Install nextcloud in tasks/core/install.yml if the nextcloud_installation_dir is present on the system. This seems to be the case because the nextcloud folder will not be renamed but moved inside nextcloud_installation_dir, if it exists already (Move nextcloud folder).

The role works fine as it is, if I take the following precautions:

• define nextcloud_installation_dir without a trailing slash

• nextcloud_installation_dir should not exist on the system

I propose to update defaults/main.yml and add a comment for documentation.