ci(swift): use PR branch to test swift integration rather than version

.github/workflows/all_plugins.yaml

@@ -131,8 +131,7 @@ jobs:
       - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938
       - uses: subosito/flutter-action@f2c4f6686ca8e8d6e6d0f28410eeef506ed66aff
         with:
-        # TODO - enabling swift is on `master` channel at the moment. Update when it's on `stable`
-          channel: 'master'
+          channel: 'stable'
       - name: Setup firebase_core example app to test Swift integration
         # run this before running melos boostrap to ensure the example app is set up
         run: |

.github/workflows/scripts/swift-integration.dart

@@ -9,11 +9,91 @@ void main(List<String> arguments) async {
   if (arguments.isEmpty) {
     throw Exception('No FlutterFire dependency arguments provided.');
   }
+
+  // Get the current git branch from GitHub Actions environment or fallback to git command
+  final currentBranch = await getCurrentBranch();
+  print('Current branch: $currentBranch');
+
+  // Update all Package.swift files to use branch dependencies
+  await updatePackageSwiftFiles(currentBranch, arguments);
+
   final plugins = arguments.join(',');
   await buildSwiftExampleApp('ios', plugins);
   await buildSwiftExampleApp('macos', plugins);
 }
 
+Future<String> getCurrentBranch() async {
+  // Try GitHub Actions environment variables first
+  String? branch = Platform.environment['GITHUB_HEAD_REF']; // For pull requests
+
+  if (branch == null || branch.isEmpty) {
+    branch = Platform.environment['GITHUB_REF_NAME']; // For direct pushes
+  }
+
+  if (branch == null || branch.isEmpty) {
+    // Fallback to git command for local testing
+    print('GitHub Actions environment variables not found, trying git command...');
+    final result = await Process.run('git', ['branch', '--show-current']);
+    if (result.exitCode != 0) {
+      throw Exception('Failed to get current git branch: ${result.stderr}');
+    }
+    branch = result.stdout.toString().trim();
+  }
+
+  if (branch.isEmpty) {
+    throw Exception('Could not determine current branch from GitHub Actions environment or git command');
+  }
+
+  return branch;
+}
+
+Future<void> updatePackageSwiftFiles(String branch, List<String> packages) async {
+  print('Updating Package.swift files to use branch: $branch');
+
+  // Update each package's Package.swift files
+  for (final package in packages) {
+    await updatePackageSwiftForPackage(package, branch);
+  }
+}
+
+Future<void> updatePackageSwiftForPackage(String packageName, String branch) async {
+  // Check both ios and macos directories
+  final platforms = ['ios', 'macos'];
+
+  for (final platform in platforms) {
+    final packageSwiftPath = 'packages/$packageName/$packageName/$platform/$packageName/Package.swift';
+    final file = File(packageSwiftPath);
+
+    if (!file.existsSync()) {
+      print('Warning: Package.swift not found at $packageSwiftPath');
+      continue;
+    }
+
+    print('Updating $packageSwiftPath');
+    final content = await file.readAsString();
+
+    // Replace exact version dependency with branch dependency
+    String updatedContent = content;
+
+    // Pattern to match the exact version dependency
+    final exactVersionPattern = RegExp(
+      r'\.package\(url: "https://github\.com/firebase/flutterfire", exact: [^)]+\)',
+      multiLine: true
+    );
+
+    // Replace with branch dependency
+    final branchDependency = '.package(url: "https://github.com/firebase/flutterfire", branch: "$branch")';
+
+    if (exactVersionPattern.hasMatch(content)) {
+      updatedContent = content.replaceAll(exactVersionPattern, branchDependency);
+      await file.writeAsString(updatedContent);
+      print('✓ Updated $packageSwiftPath to use branch: $branch');
+    } else {
+      print('⚠ No exact version dependency found in $packageSwiftPath');
+    }
+  }
+}
+
 Future<void> buildSwiftExampleApp(String platform, String plugins) async {
   final initialDirectory = Directory.current;
   final platformName = platform == 'ios' ? 'iOS' : 'macOS';