Adding json.sha256 in the filter (#3459) (#3462)

Author: khkh-ms

build/Settings.cs

@@ -134,7 +134,7 @@ public class SignInfo
             public static readonly string ThirdParty = "Sign3rdParty";
             public static readonly string ToThirdPartySign = "ThirdParty";
             public static readonly string[] RuntimesToSign = new[] { "min.win-x86", "min.win-x64" };
-            public static readonly string[] FilterExtenstionsSign = new[] { ".json", ".spec", ".cfg", ".pdb", ".config", ".nupkg", ".py", ".md" };
+            public static readonly string[] FilterExtenstionsSign = new[] { ".json", "json.sha256", ".spec", ".cfg", ".pdb", ".config", ".nupkg", ".py", ".md" };
             public static readonly string SigcheckDownloadURL = "https://functionsbay.blob.core.windows.net/public/tools/sigcheck64.exe";
 
             public static readonly string[] SkipSigcheckTest = new[] {