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/config.tf

@@ -2,6 +2,8 @@
 locals {
   configfile = templatefile("${path.module}/resources/Corefile.tpl", {
     zones               = var.zones
+    override_hosts      = length(var.override_hosts) > 0
+    hosts               = var.override_hosts
     forward_dns_servers = join(" ", var.forward_dns_servers)
   })
   configfile_checksum = md5(local.configfile)