Add Nextcloud deployment and configuration

- Introduced Nextcloud module with Kubernetes resources including deployment, service, ingress, and cron job.
- Configured Apache settings for Nextcloud with SSL support and compression.
- Created secrets for mail and admin credentials.
- Added necessary environment variables for Nextcloud configuration.
- Removed unused Scaleway access and secret keys from secrets and variables.
- Updated CoreDNS module to support custom host overrides.
- Implemented backup bucket policies and lifecycle rules for Scaleway object storage.
- Enhanced IAM policies and applications for backup and email services.
- Added outputs for backup bucket and API keys.

bin/occ

@@ -0,0 +1,3 @@
+#!/bin/bash
+POD_NAME=$(kubectl get pods -n nextcloud -l app=nextcloud -o jsonpath="{.items[0].metadata.name}")
+kubectl -n nextcloud exec -it $POD_NAME -- /bin/su -s /bin/bash www-data -c "/var/www/html/occ $*"