trying UCB_BUILD_NUMBER

Author: andygruening

Assets/SequenceSDK/Editor/CreateConfigFileFromEnvironment.cs

@@ -51,7 +51,7 @@ public void OnPreprocessBuild(BuildReport report)
 
             Debug.Log($"Updated Unity Project Version to {version}");
 
-            var buildNumberStr = Environment.GetEnvironmentVariable("BUILD_TARGET_BUILD_NUMBER");
+            var buildNumberStr = Environment.GetEnvironmentVariable("UCB_BUILD_NUMBER");
             var buildNumber = int.TryParse(buildNumberStr, out var num) ? num : 0;
 
             PlayerSettings.iOS.buildNumber = buildNumber.ToString();