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/utils/wol_proxy/variables.tf

@@ -0,0 +1,32 @@
+variable "upstream" {
+  description = "Configuration for the upstream proxy"
+  type = object({
+    mac     = optional(string, "")
+    ip      = optional(string, "")
+    port    = optional(string, "")
+    scheme  = optional(string, "http")
+  })
+}
+
+# variable "fqdn" {
+#   description = "The fully qualified domain name for the app server"
+#   type        = string
+# }
+
+variable "tag" {
+  description = "The version of app to install"
+  type        = string
+  default     = "v0.4.0"
+}
+
+variable "namespace" {
+  description = "The namespace for the proxy"
+  type        = string
+  default     = "wol-proxy"
+}
+
+variable "proxy_port" {
+  description = "The port on which the proxy will listen"
+  type        = number
+  default     = 8080
+}