chore: version bin folder

packages/wyatt_continuous_deployment/.gitignore

@@ -5,3 +5,4 @@
 # Avoid committing pubspec.lock for library packages; see
 # https://dart.dev/guides/libraries/private-files#pubspeclock.
 pubspec.lock
+!bin/

packages/wyatt_continuous_deployment/bin/wyatt_continuous_deployment.dart

@@ -0,0 +1,20 @@
+import 'dart:io';
+
+import 'package:mason_logger/mason_logger.dart';
+import 'package:wyatt_continuous_deployment/src/bootstrap.dart';
+import 'package:wyatt_continuous_deployment/src/wyatt_continuous_deployment_command_runner.dart';
+
+Future<void> main(List<String> args) async {
+  await bootstrap(Logger());
+  await flushThenExit(await WyattContinuousDeploymentCommandRunner().run(args));
+}
+
+/// Flushes the stdout and stderr streams, then exits the program with the given
+/// status code.
+///
+/// This returns a Future that will never complete, since the program will have
+/// exited already. This is useful to prevent Future chains from proceeding
+/// after you've decided to exit.
+Future<dynamic> flushThenExit(int status) =>
+    Future.wait<void>([stdout.close(), stderr.close()])
+        .then<void>((_) => exit(status));