build: fix build script

Author: WeihanLi

build/build.cs

@@ -1,7 +1,7 @@
-var target = CommandLineParser.Val("target", "Default", args);
-var apiKey = CommandLineParser.Val("apiKey", "", args);
-var stable = CommandLineParser.Val("stable", null, args).ToBoolean();
-var noPush = CommandLineParser.Val("noPush", null, args).ToBoolean();
+var target = CommandLineParser.Val("target", args, "Default");
+var apiKey = CommandLineParser.Val("apiKey", args);
+var stable = CommandLineParser.BooleanVal("stable", args);
+var noPush = CommandLineParser.BooleanVal("noPush", args);
 var branchName = EnvHelper.Val("BUILD_SOURCEBRANCHNAME", "local");
 
 var solutionPath = "./WeihanLi.Web.Extensions.sln";
@@ -114,4 +114,4 @@ async Task ExecuteCommandAsync(string commandText, KeyValuePair<string, string>[
     var result = await CommandExecutor.ExecuteCommandAndOutputAsync(commandText);
     result.EnsureSuccessExitCode();
     Console.WriteLine();
-}
+}