Update publish_command.dart

Author: hannah-hyj

script/tool/lib/src/publish_command.dart

@@ -78,6 +78,11 @@ class PublishCommand extends PackageLoopingCommand {
           'Release all packages that contains pubspec changes at the current commit compares to the base-sha.\n'
           'The --packages option is ignored if this is on.',
     );
+    argParser.addFlag(
+      _batchReleaseFlag,
+      help:
+          'only release the packages that opt-in for batch release option.'
+    )
     argParser.addFlag(
       _dryRunFlag,
       help:
@@ -184,15 +189,31 @@ class PublishCommand extends PackageLoopingCommand {
 
       for (final String pubspecPath in changedPubspecs) {
         // Read the ci_config.yaml file
-        final File ciConfigFile = File(pubspecPath).parent.childFile('ci_config.yaml');
-        final String ciConfigContent = ciConfigFile.readAsStringSync();
-        final Map<String, dynamic> ciConfig =
-            yaml.loadYaml(ciConfigContent) as Map<String, dynamic>;
+
+        final String packageName = p.basename(p.dirname(pubspecPath));
+        bool isBatchReleasePackage;
+        try {
+          final File ciConfigFile = packagesDir.fileSystem
+              .file(pubspecPath)
+              .parent
+              .childFile('ci_config.yaml');
+          final YamlMap? ciConfig =
+              loadYaml(ciConfigFile.readAsStringSync()) as YamlMap?;
+          final dynamic batchValue = ciConfig?['release']?['batch'];
+          if (batchValue is! bool) {
+            printError(
+                '`release.batch` key is missing or not a boolean in ci_config.yaml for $packageName.');
+            continue;
+          }
+          isBatchReleasePackage = batchValue;
+        } catch (e) {
+          printError('Could not parse ci_config.yaml for $packageName: $e');
+          continue;
+        }
         // Skip the package if batch release flag is not set to match the ci_config.yaml
-        if(getBoolArg(_batchReleaseFlag)  != ciConfig['release']['batch'] )
-        {
+        if (getBoolArg(_batchReleaseFlag) != isBatchReleasePackage) {
           continue;
-        } 
+  
         // git outputs a relativa, Posix-style path.
         final File pubspecFile = childFileWithSubcomponents(
             packagesDir.fileSystem.directory((await gitDir).path),