Addin integration test for authenticated GitHub Packages feed

Author: devlead

tests/integration/Cake.NuGet/InProcessInstaller.cake

@@ -133,9 +133,65 @@ Task("Cake.NuGet.InProcessInstaller.VersionPinRange.Wildcard")
         });
 });
 
+Task("Cake.NuGet.InProcessInstaller.DotNetTool.AuthenticatedFeed")
+    .IsDependentOn("Cake.NuGet.InProcessInstaller.Setup")
+    .WithCriteria(() => BuildSystem.GitHubActions.IsRunningOnGitHubActions || Argument<string>("target", "Default") == "Cake.NuGet.InProcessInstaller.DotNetTool.AuthenticatedFeed")
+    .Does(()=>
+{
+    var scriptPath = Paths.Temp.Combine("./Cake.NuGet.InProcessInstaller/").CombineWithFilePath("build.cake");
+    var scriptToolsPath = Paths.Temp.Combine("./Cake.NuGet.InProcessInstaller/tools");
+    var nugetConfigPath = Paths.Temp.Combine("./Cake.NuGet.InProcessInstaller/").CombineWithFilePath("nuget.config");
+    
+    // Create NuGet.config without credentials
+    var githubToken = EnvironmentVariable("GITHUB_TOKEN");
+    
+    var nugetConfig = 
+        """
+        <?xml version="1.0" encoding="utf-8"?>
+        <configuration>
+            <packageSources>
+                <clear />
+                <add key="github" value="https://nuget.pkg.github.com/devlead/index.json" />
+            </packageSources>
+        </configuration>
+        """;
+    System.IO.File.WriteAllText(nugetConfigPath.FullPath, nugetConfig);
+
+    // If githubToken is provided, update the source with credentials using DotNetNuGetUpdateSource
+    if (!string.IsNullOrEmpty(githubToken))
+    {
+        var sourceSettings = new DotNetNuGetSourceSettings
+        {
+            Source = "https://nuget.pkg.github.com/devlead/index.json",
+            UserName = GitHubActions.Environment.Workflow.RepositoryOwner,
+            Password = githubToken,
+            StorePasswordInClearText = true,
+            ConfigFile = nugetConfigPath
+        };
+        DotNetNuGetUpdateSource("github", sourceSettings);
+    }
+
+    var script = @"#addin nuget:https://nuget.pkg.github.com/devlead/index.json?package=litjson&version=0.19.0-alpha0044&prerelease
+                var result = LitJson.JsonMapper.ToJson(new { Name = ""John"", Age = 30 });
+                ";
+
+    System.IO.File.WriteAllText(scriptPath.FullPath, script);
+
+    CakeExecuteScript(scriptPath,
+        new CakeSettings
+        {
+            EnvironmentVariables = {
+                                        { "CAKE_PATHS_TOOLS", scriptToolsPath.FullPath },
+                                        { "CAKE_PATHS_ADDINS", scriptToolsPath.Combine("Addins").FullPath },
+                                        { "CAKE_PATHS_MODULES", scriptToolsPath.Combine("Modules").FullPath }
+                                    }
+        });
+});
+
 Task("Cake.NuGet.InProcessInstaller")
     .IsDependentOn("Cake.NuGet.InProcessInstaller.Setup")
     .IsDependentOn("Cake.NuGet.InProcessInstaller.VersionPinExact")
     .IsDependentOn("Cake.NuGet.InProcessInstaller.VersionPinRange.InclusiveExclusive")
     .IsDependentOn("Cake.NuGet.InProcessInstaller.VersionPinRange.InclusiveInclusive")
-    .IsDependentOn("Cake.NuGet.InProcessInstaller.VersionPinRange.Wildcard");
+    .IsDependentOn("Cake.NuGet.InProcessInstaller.VersionPinRange.Wildcard")
+    .IsDependentOn("Cake.NuGet.InProcessInstaller.DotNetTool.AuthenticatedFeed");