Ensure BuildOptions can configure the output directory instead of forcing inline rendering

src/Docfx.App/BuildOptions.cs

@@ -16,4 +16,9 @@ public class BuildOptions
     /// Configures the markdig markdown pipeline.
     /// </summary>
     public Func<MarkdownPipelineBuilder, MarkdownPipelineBuilder>? ConfigureMarkdig { get; init; }
+
+    /// <summary>
+    /// The output directory for the site build, if not set it will be rendered inline.
+    /// </summary>
+    public string? OutputDirectory { get; init; }
 }

src/Docfx.App/Docset.cs

@@ -32,7 +32,7 @@ public static Task Build(string configPath, BuildOptions options)
     {
         return Exec(configPath, (config, configDirectory) =>
         {
-            RunBuild.Exec(config.build, options, configDirectory);
+            RunBuild.Exec(config.build, options, configDirectory, options.OutputDirectory);
             return Task.CompletedTask;
         });
     }

test/docfx.Tests/Api.verified.cs

@@ -4,6 +4,7 @@ public class BuildOptions
     {
         public BuildOptions() { }
         public System.Func<Markdig.MarkdownPipelineBuilder, Markdig.MarkdownPipelineBuilder>? ConfigureMarkdig { get; init; }
+        public string? OutputDirectory { get; init; }
     }
     public static class Docset
     {