Add 7-zip to PATH

Author: benmcmorran

azure-pipelines.yml

@@ -96,6 +96,7 @@ steps:
       Invoke-WebRequest https://www.7-zip.org/a/7z2201-x64.exe -OutFile $path
       Start-Process -FilePath $path -Args "/S" -Verb RunAs -Wait
       Remove-Item $path
+      Echo "##vso[task.prependpath]$Env:PROGRAMFILES\7-Zip\"
     displayName: Install 7zip
   - pwsh: Get-ChildItem out\vsix | Foreach-Object { 7z e $_.FullName -o$(Build.StagingDirectory)\vscode-arduino\$_.BaseName }
     displayName: Extract extension for signing