use powershell to correct ARTIFACT_PATH

Author: davegarthsimpson

.github/workflows/build.yml

@@ -432,10 +432,11 @@ jobs:
           path: ${{ env.BUILD_ARTIFACTS_PATH }}
 
       - name: Save artifact path to variable
+        shell: pwsh
         run: |
-          # Find the artifact ending with 'Windows_64bit.exe' in the specified download directory and prepend the full path
-          ARTIFACT_PATH=$(find ${{ env.BUILD_ARTIFACTS_PATH }} -name "*Windows_64bit.exe" -exec realpath {} \;)
-          echo "ARTIFACT_PATH=${ARTIFACT_PATH}" >> $GITHUB_ENV
+          $artifactPath = Get-ChildItem ${{ env.BUILD_ARTIFACTS_PATH }} -Filter "*Windows_64bit.exe" | Select-Object -First 1 | Resolve-Path -Relative
+          $fullPath = Join-Path -Path (Get-Location).Drive.Root -ChildPath $artifactPath
+          echo "ARTIFACT_PATH=$fullPath" | Out-File -FilePath $env:GITHUB_ENV -Append
 
       - name: Save Win signing certificate to file
         run: echo "${{ secrets.INSTALLER_CERT_WINDOWS_CER }}" | base64 --decode > ${{ env.INSTALLER_CERT_WINDOWS_CER }}