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/nextcloud/secrets.tf

@@ -0,0 +1,24 @@
+resource "kubernetes_secret" "nextcloud_mail_credentials" {
+  metadata {
+    name      = "nextcloud-mail-credentials"
+    namespace = kubernetes_namespace.nextcloud.metadata[0].name
+  }
+  data = {
+    username = var.app_config.smtp_user
+    password = var.app_config.smtp_password
+  }
+  type = "Opaque"
+}
+
+resource "kubernetes_secret" "nextcloud_admin_credentials" {
+  metadata {
+    name      = "nextcloud-admin-credentials"
+    namespace = kubernetes_namespace.nextcloud.metadata[0].name
+  }
+  data = {
+    username = var.app_config.admin_username
+    password = var.app_config.admin_password
+  }
+  type = "Opaque"
+}
+