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 ~}
+}

terraform/modules/utils/proxy/resources/nginx/nginx.conf

@@ -0,0 +1,48 @@
+worker_processes  auto;
+
+error_log  /dev/stderr warn;
+pid        /tmp/nginx.pid;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    proxy_temp_path /tmp/proxy_temp;
+    client_body_temp_path /tmp/client_temp;
+    fastcgi_temp_path /tmp/fastcgi_temp;
+    uwsgi_temp_path /tmp/uwsgi_temp;
+    scgi_temp_path /tmp/scgi_temp;
+
+    client_max_body_size 10M;
+    proxy_buffering off;
+    proxy_request_buffering off;
+
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /dev/stdout  main;
+
+    sendfile        on;
+
+    keepalive_timeout  65;
+
+    server {
+        listen       8888;
+        server_name  _;
+        location /health {
+            access_log off;
+            return 200 "OK";
+        }
+    }
+
+    include /etc/nginx/conf.d/*.conf;
+}
+
+stream {
+    include /etc/nginx/streams.d/*.conf;
+}

terraform/modules/utils/proxy/resources/nginx/streams.d/stream.conf.tpl

@@ -0,0 +1,13 @@
+upstream ${name} {
+%{ if resolver != "" ~}
+    resolver ${resolver};
+%{ endif ~}
+    server ${upstream}:${upstream_port}; 
+}
+server {
+    listen %{ if protocol == "UDP" ~}${port} udp;%{ else ~}${port};%{ endif }
+%{ if custom_snippet != "" ~}
+${custom_snippet}
+%{ endif ~}
+    proxy_pass ${name};
+}