fix(shorebird_cli): productFlavor casing (#502)

packages/shorebird_cli/lib/src/shorebird_flavor_mixin.dart

@@ -33,9 +33,9 @@ mixin ShorebirdFlavorMixin on ShorebirdJavaMixin {
     for (final task in '${result.stdout}'.split('\n')) {
       final match = assembleTaskPattern.matchAsPrefix(task);
       if (match != null) {
-        final variant = match.group(1)!.toLowerCase();
-        if (!variant.endsWith('test')) {
-          variants.add(variant);
+        final variant = match.group(1)!;
+        if (!variant.toLowerCase().endsWith('test')) {
+          variants.add(variant[0].toLowerCase() + variant.substring(1));
         }
       }
     }

packages/shorebird_cli/test/src/commands/init_command_test.dart

@@ -361,7 +361,14 @@ If you want to reinitialize Shorebird, please run "shorebird init --force".''',
     });
 
     test('creates shorebird.yaml for an app with flavors', () async {
-      final appIds = ['test-appId-1', 'test-appId-2', 'test-appId-3'];
+      final appIds = [
+        'test-appId-1',
+        'test-appId-2',
+        'test-appId-3',
+        'test-appId-4',
+        'test-appId-5',
+        'test-appId-6'
+      ];
       var index = 0;
       when(
         () => codePushClient.createApp(displayName: any(named: 'displayName')),
@@ -388,8 +395,11 @@ If you want to reinitialize Shorebird, please run "shorebird init --force".''',
 app_id: ${appIds[0]}
 flavors:
   development: ${appIds[0]}
-  production: ${appIds[1]}
-  staging: ${appIds[2]}'''),
+  developmentInternal: ${appIds[1]}
+  production: ${appIds[2]}
+  productionInternal: ${appIds[3]}
+  staging: ${appIds[4]}
+  stagingInternal: ${appIds[5]}'''),
       );
 
       verifyInOrder([