fix logic for pushing nuget package

build.cake

@@ -101,7 +101,7 @@ Task("Pack")
 });
 
 Task("Push")
-    //.WithCriteria<Parameters>((context, parameters) => parameters.PushNuGet)
+    .WithCriteria<Parameters>((context, parameters) => parameters.PushNuGet)
     .Does<Parameters>(parameters => 
 {
     var apiKey = EnvironmentVariable(parameters.IsNugetRelease ? "NUGET_API_KEY" : "MYGET_API_KEY");

parameters.cake

@@ -29,13 +29,13 @@ public class Parameters
         Version += "-build" + context.EnvironmentVariable("BUILD_BUILDNUMBER").Replace(".","");
 
         NuGetPushBranch = "master";
-        NuGetPushRepoName = "AvaloniaUI/Avalonia.Native";
+        NuGetPushRepoName = "https://github.com/AvaloniaUI/Avalonia.Native";
 
-        var repoName = context.EnvironmentVariable("APPVEYOR_REPO_NAME");
-        var repoBranch = context.EnvironmentVariable("APPVEYOR_REPO_BRANCH");
+        var repoName = context.EnvironmentVariable("BUILD_REPOSITORY_URI");
+        var repoBranch = context.EnvironmentVariable("BUILD_SOURCEBRANCHNAME");
         var repoTag = context.EnvironmentVariable("APPVEYOR_REPO_TAG");
         var repoTagName = context.EnvironmentVariable("APPVEYOR_REPO_TAG_NAME");
-        var pullRequestTitle = context.EnvironmentVariable("APPVEYOR_PULL_REQUEST_TITLE");
+        var pullRequestTitle = context.EnvironmentVariable("SYSTEM_PULLREQUEST_SOURCEBRANCH");
 
         if (pullRequestTitle == null 
             && string.Compare(repoName, NuGetPushRepoName, StringComparison.OrdinalIgnoreCase) == 0