Always upload test results

Always upload test results if the build fails.

Author: martincostello

appveyor.yml

@@ -15,7 +15,7 @@ nuget:
 skip_tags: false
 test: off
 
-after_build:
+on_finish:
   - ps: $wc = New-Object 'System.Net.WebClient'
   - ps: $wc.UploadFile("https://ci.appveyor.com/api/testresults/xunit/$($env:APPVEYOR_JOB_ID)", (Resolve-Path .\artifacts\TestResults\Release\AspNet.Security.OpenId.Providers.Tests_netcoreapp3.1_x64.xml))