check UNITY_EDITOR error

#701

Assets/VRM/Editor/CIBuild.cs

@@ -0,0 +1,32 @@
+using UnityEditor;
+
+namespace VRM
+{
+    public class BuildClass
+    {
+        /// <summary>
+        /// dummy build for CI
+        /// </summary>
+#if VRM_DEVELOP
+        [MenuItem(VRMVersion.MENU + "/dummy_build")]
+#endif
+        public static void Build()
+        {
+            var scenes = new string[]{
+                "./Assets/VRM.Samples/Scenes/SimpleViewer.unity",
+            };
+
+            var report = BuildPipeline.BuildPlayer(
+                    scenes,
+                    "./Build/DummyBuild.exe",
+                    BuildTarget.StandaloneWindows,
+                    BuildOptions.Development
+            );
+
+            if (report.summary.result != UnityEditor.Build.Reporting.BuildResult.Succeeded)
+            {
+                throw new System.Exception(report.summary.ToString());
+            }
+        }
+    }
+}

Assets/VRM/Editor/CIBuild.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c0cbbad79b820c540af31a5d62eab5c7
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: