Support for notifying user if an update is available for Directus CLI (#6852)

* Notify user if an update is available

* Replaced console log with logger

* Fix lint error

* Update api/src/start.ts

* Make update check non-blocking

* Remove unused async call

Co-authored-by: Rijk van Zanten <rijkvanzanten@me.com>

api/src/start.ts

@@ -1,6 +1,8 @@
 import emitter, { emitAsyncSafe } from './emitter';
 import env from './env';
 import logger from './logger';
+import checkForUpdate from 'update-check';
+import pkg from '../package.json';
 
 // If this file is called directly using node, start the server
 if (require.main === module) {
@@ -18,6 +20,16 @@ export default async function start(): Promise<void> {
 
 	server
 		.listen(port, () => {
+			checkForUpdate(pkg)
+				.then((update) => {
+					if (update) {
+						logger.warn(`Update available: ${pkg.version} -> ${update.latest}`);
+					}
+				})
+				.catch(() => {
+					// No need to log/warn here. The update message is only an informative nice-to-have
+				});
+
 			logger.info(`Server started at port ${port}`);
 			emitAsyncSafe('server.start');
 		})