backend-common: make loadBackendConfig return config directly and log all resolved app-configs

plugins/rollbar-backend/src/service/standaloneServer.ts

@@ -20,7 +20,6 @@ import {
   createServiceBuilder,
   loadBackendConfig,
 } from '@backstage/backend-common';
-import { ConfigReader } from '@backstage/config';
 import { createRouter } from './router';
 
 export interface ServerOptions {
@@ -33,7 +32,7 @@ export async function startStandaloneServer(
   options: ServerOptions,
 ): Promise<Server> {
   const logger = options.logger.child({ service: 'rollbar-backend' });
-  const config = ConfigReader.fromConfigs(await loadBackendConfig());
+  const config = await loadBackendConfig({ logger });
 
   logger.debug('Creating application...');