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/ingress.tf

@@ -0,0 +1,34 @@
+# resource "kubernetes_ingress_v1" "proxy" {
+#   metadata {
+#     name      = "ingress"
+#     namespace = kubernetes_namespace.proxy.metadata[0].name
+
+#     annotations = {
+#       "kubernetes.io/ingress.class"              = "public"
+#       "cert-manager.io/cluster-issuer"           = "letsencrypt-prod"
+#       "kubernetes.io/tls-acme"                   = "true"
+#       "nginx.ingress.kubernetes.io/ssl-redirect" = "true"
+#     }
+#   }
+#   spec {
+#     tls {
+#       hosts       = [var.fqdn]
+#       secret_name = "proxy-tls"
+#     }
+#     rule {
+#       host = var.fqdn
+#       http {
+#         path {
+#           backend {
+#             service {
+#               name = "upstream"
+#               port {
+#                 number = var.proxy_port
+#               }
+#             }
+#           }
+#         }
+#       }
+#     }
+#   }
+# }