add postInclude for adding length integrator user action to a job

Simulation/G4Utilities/G4UserActions/python/PostIncludes.py

+# Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
+
+def LengthIntegrator(configFlags, name="G4UA::ISFFullUserActionSvc", **kwargs):
+    
+    from AthenaConfiguration.ComponentAccumulator import ComponentAccumulator
+    from AthenaConfiguration.ComponentFactory import CompFactory
+    
+    result = ComponentAccumulator()
+    
+    #Setting up the CA for the LengthIntegrator
+    from G4UserActions.G4UserActionsConfigNew import LengthIntegratorToolCfg
+    actionAcc = ComponentAccumulator()
+    actions = []
+    actions += [actionAcc.popToolsAndMerge(LengthIntegratorToolCfg(configFlags))]
+    actionAcc.setPrivateTools(actions)
+    lengthIntegratorAction = result.popToolsAndMerge(actionAcc)
+    
+    actionList = lengthIntegratorAction
+    #Setting up UserActionsService
+    kwargs.setdefault("UserActionTools",actionList)
+    result.addService(CompFactory.G4UA.UserActionSvc(name, **kwargs))
+
+    return result

Simulation/G4Utilities/G4UserActions/python/__init__.py

+# Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
+
+from .PostIncludes import LengthIntegrator
+ 
+__all__ = ['LengthIntegrator']