auth-backend: add plugin export for new backend system

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/auth-backend/dev/index.ts

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { createBackend } from '@backstage/backend-defaults';
+import { authPlugin } from '../src';
+import { authModuleGoogleProvider } from '@backstage/plugin-auth-backend-module-google-provider';
+
+const backend = createBackend();
+
+backend.add(authPlugin);
+backend.add(authModuleGoogleProvider);
+
+backend.start();