Pass context to event publishing.

To allow tracing propagation via events, we need to pass the context
to the `Publish` function of reva events. This adds the context
everywhere where events are published. If there was no context to pass,
we started a new one with `context.Background()`.

services/storage-users/pkg/command/trash_bin.go

@@ -37,7 +37,7 @@ func PurgeExpiredResources(cfg *config.Config) *cli.Command {
 				return err
 			}
 
-			if err := events.Publish(stream, event.PurgeTrashBin{ExecutionTime: time.Now()}); err != nil {
+			if err := events.Publish(c.Context, stream, event.PurgeTrashBin{ExecutionTime: time.Now()}); err != nil {
 				return err
 			}