Sets ErrorActionPreference to Stop

There are a few areas of the script which assume the previous lines have worked,
without asserting that that's true.

ErrorActionPreference ensures that the script stops as soon as there is an error,
which makes it easier to debug what's happening as the errors become steadily more
misleading the further down the script it gets.

Author: Steve McGill

Create-SitecoreModule-DockerAssetImage.ps1

@@ -30,6 +30,8 @@ param(
     [switch] $GenerateCdContentDirectory
 )
 
+$ErrorActionPreference = "Stop"
+
 #---------------------------------[Read configuration]------------------------------------------------
 $configurationPath = "configuration.json"
 $jsonConfiguration = Get-Content -Path $configurationPath | ConvertFrom-Json