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/grafana/variables.tf

@@ -0,0 +1,22 @@
+variable "fqdn" {
+  description = "The fully qualified domain name for the app server"
+  type        = string
+  default     = ""
+}
+
+variable "issuer" {
+  description = "The issuer for the certificate"
+  type        = string
+  default     = "internal-ca"
+}
+
+variable "tag" {
+  description = "Grafana image tag"
+  type        = string
+  default     = "latest"
+}
+
+variable "persistent_folder" {
+  description = "The path to the persistent folder"
+  type        = string
+}