Add custom error pages and Nginx configuration for proxy module

- Introduced custom HTML error pages for various HTTP status codes (400, 401, 403, 404, 408, 429, 500, 502, 503, 504) in the proxy module.
- Created a .gitignore file to exclude non-HTML files in the error resources directory.
- Updated Nginx configuration to serve custom error pages for upstream errors.
- Added new Nginx configuration templates for handling HTTP and stream protocols.
- Implemented Wireguard configuration templates and associated variables for secure connections.
- Established Kubernetes resources for Stunnel and Wireguard, including deployment, service accounts, and config maps.
- Defined variables for the Stunnel and Wireguard modules to facilitate configuration.
- Created a new Wol Proxy module with Kubernetes resources for deployment and service management.

terraform/modules/apps/mail/variables.tf

@@ -92,3 +92,15 @@ variable "ca_pem" {
   type        = string
   sensitive   = true
 }
+
+variable "postfix_use_host_networking" {
+  description = "Whether to use host networking for the Postfix container"
+  type        = bool
+  default     = false
+}
+
+variable "dovecot_use_host_networking" {
+  description = "Whether to use host networking for the Dovecot container"
+  type        = bool
+  default     = false
+}