Add support to externeal subdomain

modules/networking/caddy.nix

@@ -50,6 +50,32 @@ in
       default = "";
     };
 
+    # List of extra caddy.virtualHost
+    extraVirtualHosts = lib.mkOption {
+      type = lib.types.listOf (
+        lib.types.submodule {
+          options = {
+            subdomain = lib.mkOption {
+              type = lib.types.str;
+              description = "The subdomain for the virtual host.";
+            };
+            host = lib.mkOption {
+              type = lib.types.str;
+              description = "The host address for the reverse proxy.";
+            };
+            domain = lib.mkOption {
+              type = lib.types.str;
+              description = "The domain for the virtual host.";
+            };
+          };
+        }
+      );
+      description = ''
+        A list of virtual hosts outside nixos/colmena config.
+      '';
+      default = [ ];
+    };
+
   };
 
   config = lib.mkIf cfg.enable {
@@ -134,6 +160,17 @@ in
         ) cfg.domainsList
       );
 
+      virtualHosts = lib.foldl' (
+        acc: extraVirtualHost:
+        acc
+        // {
+          "${extraVirtualHost.subdomain}.${extraVirtualHost.domain}".extraConfig = ''
+            reverse_proxy ${extraVirtualHost.host}
+            import cloudflare_${extraVirtualHost.domain}
+          '';
+        }
+      ) { } cfg.extraVirtualHosts;
+
     };
 
     systemd.services.caddy.serviceConfig = {