samples : 增加自定义构建页面的扩展示例

Assets/YooAsset/Samples~/Extension Sample/Editor/CustomBuildPipeline.meta

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Assets/YooAsset/Samples~/Extension Sample/Editor/CustomBuildPipeline/CustomBuildPipelineViewer.cs

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+using System;
+using System.IO;
+using System.Linq;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+using UnityEditor.UIElements;
+using UnityEngine.UIElements;
+using YooAsset.Editor;
+
+[BuildPipelineAttribute("CustomBuildPipeline")]
+internal class CustomBuildPipelineViewer : BuiltinBuildPipelineViewer
+{
+    protected override string GetDefaultPackageVersion()
+    {
+        return "v1.0.0";
+    }
+}

Assets/YooAsset/Samples~/Extension Sample/Editor/CustomBuildPipeline/CustomBuildPipelineViewer.cs.meta

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