fix image upload corruption (#1569)

CHANGELOG.md

@@ -37,6 +37,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Ignore errors deleting old HLS segments; this should improve stream reliability
 - Update show year when changed within Plex
 - Fix crop scale behavior with NVIDIA, QSV acceleration
+- Fix bug that corrupted uploaded images (watermarks, channel logos)
+  - Re-uploading images should fix them 
 
 ### Changed
 - Upgrade from .NET 7 to .NET 8

ErsatzTV.Infrastructure/Images/ImageCache.cs

@@ -40,6 +40,9 @@ public class ImageCache : IImageCache
             // ReSharper disable once UseAwaitUsing
             using (var fs = new FileStream(tempFileName, FileMode.OpenOrCreate, FileAccess.Write))
             {
+                // overwrite anything that's already there
+                fs.SetLength(0);
+
                 await stream.CopyToAsync(fs);
             }