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.

terraform/modules/apps/coredns/resources/Corefile.tpl

@@ -1,4 +1,12 @@
 .:53 {
+%{ if override_hosts ~}
+    hosts {
+%{ for h in hosts ~}
+      ${h.ip} ${h.name}
+%{ endfor ~}
+      fallthrough
+    }
+%{ endif ~}
     errors
     health {
       lameduck 5s