подключил команду создания промежуточных папок

scripts/IosSteps.txt

@@ -2,4 +2,5 @@ create backup for 'BuildSample'
 inside 'BuildSample/BuildSample.sln' remove NotCompileApp project
 clean 'BuildSample/BuildSample.sln' for 'Release|iPhone'
 build 'BuildSample/BuildSample.sln' for 'Release|iPhone'
+create dirs 'Output/Appstore/Artifacts'
 sh echo hello from Rustam

scripts/StepRunner/StepsRunner.py

@@ -1,5 +1,6 @@
 from CommandBuilders.CleanBuildCommandBuilder import CleanBuildCommandBuilder
 from CommandBuilders.CreateBackupCommandBuilder import CreateBackupCommandBuilder
+from CommandBuilders.MakeDirsCommandBuilder import MakeDirsCommandBuilder
 from CommandBuilders.RemoveProjectCommandBuilder import RemoveProjectCommandBuilder
 from CommandBuilders.ShCommandBuilder import ShCommandBuilder
 
@@ -11,6 +12,7 @@ class StepsRunner:
 		self.shCommandBuilder = ShCommandBuilder()
 		self.removeProjectBuilder = RemoveProjectCommandBuilder()
 		self.createBackupBuilder = CreateBackupCommandBuilder()
+		self.createDirs = MakeDirsCommandBuilder()
 
 		buildUtilPath = config['build_tool']
 		self.cleanBuilder = CleanBuildCommandBuilder(buildUtilPath, 'clean')
@@ -46,6 +48,9 @@ class StepsRunner:
 		elif self.createBackupBuilder.isCreateBackup(line):
 			cmd = self.createBackupBuilder.getCommandFor(line)
 			cmd.execute()
+		elif self.createDirs.isMakeDirsCommand(line):
+			cmd = self.createDirs.getCommandFor(line)
+			cmd.execute()
 		else:
 			msg = "unrecognised step. Line: '{0}'".format(line)
 			raise Exception(msg)