delete unused trap

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

ocis-pkg/sync/trap.go

@@ -1,21 +0,0 @@
-package sync
-
-import (
-	"context"
-	"os"
-	"os/signal"
-
-	"github.com/oklog/run"
-)
-
-// Trap listens to interrupt signals and handles context cancellation and channel closing on a group run.
-func Trap(gr *run.Group, cancel context.CancelFunc) {
-	stop := make(chan os.Signal, 1)
-	gr.Add(func() error {
-		signal.Notify(stop, os.Interrupt)
-		<-stop
-		return nil
-	}, func(err error) {
-		cancel()
-	})
-}