cache bust xmltv images (#1771)

CHANGELOG.md

@@ -10,6 +10,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - Items in these libraries will have tag metadata added from folders just like local Other Video libraries
   - Thanks @raknam for adding this feature!
 
+### Fixed
+- Add basic cache busting to XMLTV image URLs
+  - This should help with clients not showing correct channel logos or posters
+
 ### Changed
 - Remove some unnecessary API calls related to media server scanning and paging
 

ErsatzTV.Application/Channels/Queries/GetChannelGuideHandler.cs

@@ -36,10 +36,12 @@ public class GetChannelGuideHandler : IRequestHandler<GetChannelGuide, Either<Ba
             return BaseError.New($"Required file {channelsFile} is missing");
         }
 
-        string accessTokenUri = string.Empty;
+        long mtime = File.GetLastWriteTime(channelsFile).Ticks;
+
+        var accessTokenUri = $"?v={mtime}";
         if (!string.IsNullOrWhiteSpace(request.AccessToken))
         {
-            accessTokenUri = $"?access_token={request.AccessToken}";
+            accessTokenUri += $"&access_token={request.AccessToken}";
         }
 
         string channelsFragment = await File.ReadAllTextAsync(channelsFile, Encoding.UTF8, cancellationToken);

ErsatzTV.Infrastructure/Plex/Models/PlexMediaContainerResponse.cs

@@ -9,7 +9,7 @@ public class PlexMediaContainerResponse<T>
 
 public class PlexMediaContainerDirectoryContent<T>
 {
-    public List<T> Directory { get; set; }
+    public List<T> Directory { get; set; } = [];
 }
 
 public class PlexMediaContainerMetadataContent<T>