add windows powershell script for env variable

Author: ThorstenBux

share/packaging/win-env.ps1

@@ -1,4 +1,4 @@
-Get-ChildItem Env:
-$env:HASH = git log --max-count=1 --pretty=format:"%H"
-$env:MESSAGE = git log --max-count=1 --pretty=format:"%s"
-$env:BUILDTIME = [int][double]::Parse((Get-Date -UFormat %s))
+# $env:HASH = git log --max-count=1 --pretty=format:"%H"
+# $env:MESSAGE = git log --max-count=1 --pretty=format:"%s"
+$env:BUILDTIME = [int][double]::Parse((Get-Date -UFormat %s))
+Write-Host "##vso[task.setvariable variable=BUILDTIME]$Env:BUILDTIME"