fix codecov publishing

Author: arturcic

build/build/Tasks/Test/PublishCoverage.cs

@@ -19,21 +19,20 @@ public override bool ShouldRun(BuildContext context)
 
     public override void Run(BuildContext context)
     {
-        var coverageFiles = context.GetFiles($"{Paths.TestOutput}/*.coverage.*.xml");
+        var coverageFiles = context
+            .GetFiles($"{Paths.TestOutput}/*.coverage.*.xml")
+            .Select(file =>  context.MakeRelative(file).ToString()).ToArray();
 
         var token = context.Credentials?.CodeCov?.Token;
         if (string.IsNullOrEmpty(token))
         {
             throw new InvalidOperationException("Could not resolve CodeCov token.");
         }
 
-        foreach (var coverageFile in coverageFiles)
+        context.Codecov(new CodecovSettings
         {
-            context.Codecov(new CodecovSettings
-            {
-                Files = new[] { coverageFile.ToString() },
-                Token = token
-            });
-        }
+            Files = coverageFiles,
+            Token = token
+        });
     }
 }