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/resources/apache2/sites-enabled/999-default.conf

@@ -0,0 +1,11 @@
+<VirtualHost *:443>
+        ServerAdmin webmaster@localhost
+        DocumentRoot /var/www/html
+
+        ErrorLog ${APACHE_LOG_DIR}/error.log
+        CustomLog ${APACHE_LOG_DIR}/access.log combined
+
+        SSLEngine on
+        SSLCertificateFile /etc/ssl/certs/private/tls.crt
+        SSLCertificateKeyFile /etc/ssl/certs/private/tls.key
+ </VirtualHost>