do not DebugDraw on CI

Author: antonfirsov

tests/ImageSharp.Drawing.Tests/TestUtilities/DebugDraw.cs

@@ -12,7 +12,7 @@ namespace SixLabors.ImageSharp.Drawing.Tests
     internal class DebugDraw
     {
         private static readonly IBrush TestBrush = Brushes.Solid(Color.Red);
-        
+
         private static readonly IPen GridPen = Pens.Solid(Color.Aqua, 0.5f);
 
         private readonly string outputDir;
@@ -24,18 +24,23 @@ public DebugDraw(string outputDir)
 
         public void Polygon(IPath path, float gridSize = 10f, float scale = 10f, [CallerMemberName]string testMethod = "")
         {
+            if (TestEnvironment.RunsOnCI)
+            {
+                return;
+            }
+
             path = path.Transform(Matrix3x2.CreateScale(scale) * Matrix3x2.CreateTranslation(gridSize, gridSize));
             RectangleF bounds = path.Bounds;
             gridSize *= scale;
 
             using Image img = new Image<Rgba32>((int)(bounds.Right + 2 * gridSize), (int)(bounds.Bottom + 2 * gridSize));
             img.Mutate(ctx => DrawGrid(ctx.Fill(TestBrush, path), bounds, gridSize));
-            
+
             string outDir = TestEnvironment.CreateOutputDirectory(this.outputDir);
             string outFile = System.IO.Path.Combine(outDir, testMethod + ".png");
             img.SaveAsPng(outFile);
         }
-        
+
         private static PointF P(float x, float y) => new PointF(x, y);
 
         private static void DrawGrid(IImageProcessingContext ctx, RectangleF rect, float gridSize)
@@ -53,4 +58,4 @@ private static void DrawGrid(IImageProcessingContext ctx, RectangleF rect, float
             }
         }
     }
-}
+}