message: Add index.ts changes
diff: @@ -48,6 +48,29 @@ export default async function createPlugin({
  }
  ```
  +### src/index.ts
  +
  +```diff
  +diff --git a/packages/backend/src/index.ts b/packages/backend/src/index.ts
  +index f2b14b2..2c64f47 100644
  +--- a/packages/backend/src/index.ts
  ++++ b/packages/backend/src/index.ts
  +@@ -22,6 +22,7 @@ import { Config } from '@backstage/config';
  + import app from './plugins/app';
  ++import jenkins from './plugins/jenkins';
  + import scaffolder from './plugins/scaffolder';
  +@@ -56,6 +57,7 @@ async function main() {
  + const authEnv = useHotMemoize(module, () => createEnv('auth'));
  ++ const jenkinsEnv = useHotMemoize(module, () => createEnv('jenkins'));
  + const proxyEnv = useHotMemoize(module, () => createEnv('proxy'));
  +@@ -63,6 +65,7 @@ async function main() {
  +
  + const apiRouter = Router();
  + apiRouter.use('/catalog', await catalog(catalogEnv));
  ++ apiRouter.use('/jenkins', await jenkins(jenkinsEnv));
  + apiRouter.use('/scaffolder', await scaffolder(scaffolderEnv));
  +```
  +
  This plugin must be provided with a JenkinsInfoProvider, this is a strategy object for finding the Jenkins instance and job for an entity.
  There is a standard one provided, but the Integrator is free to build their own.
  