getSessionIngressAuthToken function
Get session ingress authentication token. Priority: env var > file descriptor > well-known file.
Implementation
String? getSessionIngressAuthToken() {
// 1. Check environment variable.
final envToken = Platform.environment['MAGE_SESSION_ACCESS_TOKEN'];
if (envToken != null && envToken.isNotEmpty) return envToken;
// 2. Check file descriptor (legacy path), with file fallback.
return _getTokenFromFileDescriptor();
}