Merge pull request #1001 from AlanDavison/powershell-shebangs

Add shebangs to allow running PowerShell scripts directly

build/scripts/prepare-install-package.ps1

@@ -1,3 +1,5 @@
+#!/usr/bin/env pwsh
+
 #
 #
 # Note: On Windows, this script *does not* set Linux permissions. The final changes are handled by the

build/scripts/set-smapi-version.ps1

@@ -1,3 +1,5 @@
+#!/usr/bin/env pwsh
+
 . "$PSScriptRoot\lib\in-place-regex.ps1"
 
 # get version number