Loop through ARM output and set variables

setVarsFromARMOutput.ps1

param (
  [Parameter(Mandatory=$true)][string]$ARMOutput
)

$json = $ARMOutput | convertfrom-json

$json.PSObject.Properties | ForEach-Object {
    Write-Host "##vso[task.setvariable variable=$($_.name);]$($_.value)"
}