Update ACME configurations

modules/proxy.nix

@@ -16,7 +16,7 @@ proxy_set_header Upgrade $http_upgrade;
 proxy_set_header Connection $connection_upgrade;
 '';
 		};
-		serverAliases = [ "${alias name}" ];
+		serverAliases = lib.mkIf dest.genAliases [ "${alias name}" ];
 	};
 
 in with lib; {
@@ -40,6 +40,12 @@ in with lib; {
 				{ name, config, options, ... }:
 				{
 					options = {
+						genAliases = mkOption {
+							type = types.bool;
+							description = "Whether to auto-generate short alias name";
+							default = true;
+						};
+
 						target = mkOption {
 							type = types.str;
 							description = ''The destination that is being proxied.'';