Fix thumbnails not being deleted from temp folder

src/Jellyfin.Drawing.Skia/SkiaEncoder.cs

@@ -209,8 +209,11 @@ public class SkiaEncoder : IImageEncoder
             return default;
         }
 
-        using var codec = SKCodec.Create(safePath, out var result);
-
+        SKCodec? codec = null;
+        bool isSafePathTemp = !string.Equals(Path.GetFullPath(safePath), Path.GetFullPath(path), StringComparison.OrdinalIgnoreCase);
+        try
+        {
+            codec = SKCodec.Create(safePath, out var result);
             switch (result)
             {
                 case SKCodecResult.Success:
@@ -231,7 +234,6 @@ public class SkiaEncoder : IImageEncoder
                 default:
                 {
                     var boundsInfo = SKBitmap.DecodeBounds(safePath);
-
                     if (boundsInfo.Width > 0 && boundsInfo.Height > 0)
                     {
                         return new ImageDimensions(boundsInfo.Width, boundsInfo.Height);
@@ -241,10 +243,38 @@ public class SkiaEncoder : IImageEncoder
                         "Unable to determine image dimensions for {FilePath}: {SkCodecResult}",
                         path,
                         result);
+
                     return default;
                 }
             }
         }
+        finally
+        {
+            try
+            {
+                codec?.Dispose();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogDebug(ex, "Error by closing codec for {FilePath}", safePath);
+            }
+
+            if (isSafePathTemp)
+            {
+                try
+                {
+                    if (File.Exists(safePath))
+                    {
+                        File.Delete(safePath);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogDebug(ex, "Unable to remove temporary file '{TempPath}'", safePath);
+                }
+            }
+        }
+    }
 
     /// <inheritdoc />
     /// <exception cref="ArgumentNullException">The path is null.</exception>