Try and properly support having config.d.ts away from the root folder

Signed-off-by: Karan Shah <karan.shah@simplybusiness.co.uk>

plugins/airbrake-backend/src/config/config.d.ts

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2021 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.
+ */
+
+export interface Config {
+  /** Configuration options for the Airbrake plugin */
+  airbrake: {
+    /**
+     * The API Key to authenticate requests. More details on how to get this here: https://airbrake.io/docs/api/#authentication
+     */
+    apiKey: string;
+  };
+}

plugins/airbrake-backend/src/config/index.ts

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import { Config } from '../../config';
+import { Config } from './config';
 
 export { extractAirbrakeConfig } from './ExtractAirbrakeConfig';
 export type AirbrakeConfig = Config['airbrake'];