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/proxy/resources/nginx/conf.d/default.conf.tpl

@@ -0,0 +1,54 @@
+server {
+    listen ${http_port};
+%{ if tls ~}
+    listen ${https_port} ssl;
+    ssl_certificate /etc/ssl/certs/private/tls.crt;
+    ssl_certificate_key /etc/ssl/certs/private/tls.key;
+    ssl_protocols TLSv1.2 TLSv1.3;
+%{ endif ~}
+    server_name ${fqdn};
+    # Custom error page for upstream errors
+%{ for e in errors ~}
+    error_page ${e} /errors/${e}.html;
+    location = /errors/${e}.html {
+        root /usr/share/nginx/html;
+        internal;
+    }
+%{ endfor ~}
+%{ if custom_snippet != "" ~}
+${custom_snippet}
+%{ endif ~}
+%{ if auth ~}
+location = /auth {
+    internal;
+    proxy_pass http://localhost:5000/;
+    proxy_pass_request_body off;
+    proxy_set_header Content-Length "";
+    proxy_set_header Authorization $http_authorization;
+}
+%{ endif }
+%{ for l in locations ~}
+    location ${l.path} {
+%{ if l.resolver == "" ~}
+%{ if resolver != "" ~}
+        resolver ${resolver};
+%{ endif ~}
+%{ else ~}
+        resolver ${l.resolver};
+%{ endif ~}
+%{ if l.private ~}
+        auth_request /auth<;
+%{ endif ~}
+        set $upstream "%{ if l.upstream != "" ~}${l.upstream}%{ else ~}${upstream}%{ endif ~}"; 
+%{ if l.rewrite != "" ~}
+        rewrite ${l.rewrite};
+%{ endif ~}
+        proxy_pass $upstream;
+        proxy_http_version 1.1;
+%{ for k,v in l.headers ~}        
+        proxy_set_header ${k} ${v};
+%{ endfor ~}
+        proxy_intercept_errors on;
+    }
+%{ endfor ~}
+}