Enable and configure Nextcloud server-side encryption in playbook

[artis3n]

https://docs.nextcloud.com/server/12/admin_manual/configuration_files/encryption_configuration.html#occ-encryption-label

[artis3n]

See: #39 (comment)

Encryption should be enabled by a group in the inventory file, but off by default.

[artis3n]

https://docs.nextcloud.com/server/13/admin_manual/configuration_files/encryption_configuration.html#occ-encryption-label

https://docs.nextcloud.com/server/13/admin_manual/configuration_server/occ_command.html#encryption-label

[artis3n]

These are the commands necessary for server-side encryption:

sudo -u nginx php occ app:enable encryption
sudo -u nginx php occ encryption:enable
sudo -u nginx php occ maintence:mode --on
sudo -u nginx php occ encryption:encrypt-all
sudo -u nginx php occ maintence:mode --off

The sudo -u nginx php occ encryption:encrypt-all command requires user input (y/n) that does not appear to be able to be automated. I'll have to look into that.