Make script location-independent

citrix_collector.ps1

@@ -3,6 +3,6 @@ $Config = Import-PowerShellDataFile "$PSScriptRoot\Configuration\Config.psd1"
 $FileName = "$($Config.PrometheusCollectorDir)\$($Config.PrometheusCollectorFile)"
 
 while ($True) {
-    & .\New-CitrixMetrics.ps1 | Out-File $FileName -Encoding "UTF8"
+    & $PSScriptRoot\New-CitrixMetrics.ps1 | Out-File $FileName -Encoding "UTF8"
     Start-Sleep -Seconds 30
 }