[Infra] exclude 3.1, x86 from test

Author: reegeek

Build/Nuke/ProjectExtensions.cs

@@ -56,7 +56,7 @@ public static IReadOnlyCollection<string> GetPlatformsForTests(this Project proj
             if (azurePipelines != null && x.framework.Contains("2.2"))
                 return false;
 
-            //exclude netcore 2.1, 2.2, 3.0, 5.0 in x86 because is not well handle by azure pipelines and github actions on windows
+            //exclude netcore 2.1, 2.2, 3.0, 3.1, 5.0 in x86 because is not well handle by azure pipelines and github actions on windows
             if (x.platform != "x86")
                 return true;
             if (x.framework == null)
@@ -67,6 +67,8 @@ public static IReadOnlyCollection<string> GetPlatformsForTests(this Project proj
                 return false;
             if (x.framework.Contains("3.0"))
                 return false;
+            if (x.framework.Contains("3.1"))
+                return false;
             if (x.framework.Contains("50"))
                 return false;
             return true;