Improved build

Build/Program.cs

@@ -18,10 +18,11 @@
 }
 
 const string defaultNuGetSource = "https://api.nuget.org/v3/index.json";
+Environment.SetEnvironmentVariable("DOTNET_NUGET_SIGNATURE_VERIFICATION", "false");
 var configuration = GetProperty("configuration", "Release");
 var apiKey = GetProperty("apiKey", "");
-var integrationTests = bool.Parse(GetProperty("integrationTests", UnderTeamCity.ToString()));
-var defaultVersion = NuGetVersion.Parse(GetProperty("version", "1.0.0-dev", UnderTeamCity));
+var integrationTests = bool.Parse(GetProperty("integrationTests", CI.ToString()));
+var defaultVersion = NuGetVersion.Parse(GetProperty("version", "1.0.0-dev", CI));
 var outputDir = Path.Combine(currentDir, "CSharpInteractive", "bin", configuration);
 var templateOutputDir = Path.Combine(currentDir, "CSharpInteractive.Templates", "bin", configuration);
 var dockerLinuxTests = HasLinuxDocker();

Build/Tools.cs

@@ -2,10 +2,13 @@
 using HostApi;
 using NuGet.Versioning;
 // ReSharper disable CheckNamespace
+// ReSharper disable InconsistentNaming
 
 internal static class Tools
 {
-    public static bool UnderTeamCity => Environment.GetEnvironmentVariable("TEAMCITY_VERSION") != default;
+    public static bool CI => 
+        Environment.GetEnvironmentVariable("TEAMCITY_VERSION") is not null
+        || Environment.GetEnvironmentVariable("CI") == "true";
 
     public static NuGetVersion GetNextNuGetVersion(NuGetRestoreSettings settings, NuGetVersion defaultVersion)
     {
@@ -94,7 +97,7 @@ public static void Run(ICommandLine commandLine)
 
     public static void Exit()
     {
-        if (!Console.IsInputRedirected && !UnderTeamCity)
+        if (!Console.IsInputRedirected && !CI)
         {
             var foregroundColor = Console.ForegroundColor;
             try