memory improvements (#1127)

* regularly release memory

* don't aggressively GC while legacy streaming

* update changelog

ErsatzTV/Services/SchedulerService.cs

@@ -100,6 +100,8 @@ public class SchedulerService : BackgroundService
             await ScanEmbyMediaSources(cancellationToken);
 #endif
             await MatchTraktLists(cancellationToken);
+
+            await ReleaseMemory(cancellationToken);
         }
         catch (Exception ex) when (ex is TaskCanceledException or OperationCanceledException)
         {
@@ -270,4 +272,7 @@ public class SchedulerService : BackgroundService
 
     private ValueTask DeleteOrphanedArtwork(CancellationToken cancellationToken) =>
         _workerChannel.WriteAsync(new DeleteOrphanedArtwork(), cancellationToken);
+
+    private ValueTask ReleaseMemory(CancellationToken cancellationToken) =>
+        _workerChannel.WriteAsync(new ReleaseMemory(false), cancellationToken);
 }

ErsatzTV/Services/WorkerService.cs

@@ -113,6 +113,9 @@ public class WorkerService : BackgroundService
                         case ExtractEmbeddedSubtitles extractEmbeddedSubtitles:
                             await mediator.Send(extractEmbeddedSubtitles, cancellationToken);
                             break;
+                        case ReleaseMemory aggressivelyReleaseMemory:
+                            await mediator.Send(aggressivelyReleaseMemory, cancellationToken);
+                            break;
                     }
                 }
                 catch (ObjectDisposedException) when (cancellationToken.IsCancellationRequested)