[build] Simplify installer locator script

Author: pjcollins

build-tools/automation/yaml-templates/apk-instrumentation.yaml

@@ -24,4 +24,4 @@ steps:
     testResultsFiles: ${{ parameters.testResultsFiles }}
     failTaskOnFailedTests: true
     testRunTitle: ${{ parameters.testName }}
-  condition: succeededOrFailed()
+  condition: succeededOrFailed()

build-tools/automation/yaml-templates/run-installer.yaml

@@ -3,24 +3,15 @@ parameters:
 
 steps:
 - powershell: |
-   $artifactDir = [System.IO.Path]::Combine(${{ parameters.artifactDirectory }}, "*")
-   
-   if ([Environment]::OSVersion.Platform -eq "Unix")
-   {
-     $installer = Get-ChildItem -Path $artifactDir -Include *.pkg -File
-     if (![System.IO.File]::Exists($installer)) {
-       throw [System.IO.FileNotFoundException] "$installer not found."
-     }
-     Write-Host "##vso[task.setvariable variable=XA.Provisionator.Args]$installer"
-   }
-   else
-   {
-     $installer = Get-ChildItem -Path $artifactDir -Include *.vsix -File
-     if (![System.IO.File]::Exists($installer)) {
-       throw [System.IO.FileNotFoundException] "$installer not found."
-     }
-     Write-Host "##vso[task.setvariable variable=XA.Provisionator.Args]$installer"
-   }
+    if ([Environment]::OSVersion.Platform -eq "Unix") {
+        $installer = Get-ChildItem -Path "${{ parameters.artifactDirectory }}/*" -Include *.pkg -File
+    } else {
+        $installer = Get-ChildItem -Path "${{ parameters.artifactDirectory }}\*" -Include *.vsix -File
+    }
+    if (![System.IO.File]::Exists($installer)) {
+        throw [System.IO.FileNotFoundException] "Installer not found in $artifactDirectory."
+    }
+    Write-Host "##vso[task.setvariable variable=XA.Provisionator.Args]$installer"
   displayName: find installer and set provisionator variable
 
 - task: provisionator@2