fix(flutter_tools): shorebird.yaml -> config includes auto_update (#20)

Author: felangel

packages/flutter_tools/gradle/flutter.gradle

@@ -1035,6 +1035,9 @@ class FlutterPlugin implements Plugin<Project> {
                     if (shorebirdYaml.containsKey('base_url')) {
                         content += 'base_url: ' + shorebirdYaml['base_url'] + '\n';
                     }
+                    if (shorebirdYaml.containsKey('auto_update')) {
+                        content += 'auto_update: ' + shorebirdYaml['auto_update'] + '\n';
+                    }
                     shorebirdYamlFile.write(content)
                   }                    
                 }

packages/flutter_tools/lib/src/ios/mac.dart

@@ -542,10 +542,14 @@ Please file an issue at: https://github.com/shorebirdtech/shorebird/issues/new
   }
   final StringBuffer yamlContent = StringBuffer();
   final String? baseUrl = yamlMap['base_url'] as String?;
+  final bool? autoUpdate = yamlMap['auto_update'] as bool?;
   yamlContent.writeln('app_id: $appId');
   if (baseUrl != null) {
     yamlContent.writeln('base_url: $baseUrl');
   }
+  if (autoUpdate != null) {
+    yamlContent.writeln('auto_update: $autoUpdate');
+  }
   shorebirdYaml.writeAsStringSync(yamlContent.toString(), flush: true);
 }