metropolis/cli/pkg/context: replace with signal.NotifyContext

Change-Id: I457ccb83c7e25988755bb9463a8c83fc328a722b
Reviewed-on: https://review.monogon.dev/c/monogon/+/3081
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>
diff --git a/metropolis/test/launch/cli/launch-cluster/main.go b/metropolis/test/launch/cli/launch-cluster/main.go
index e5959f3..c9b9dec 100644
--- a/metropolis/test/launch/cli/launch-cluster/main.go
+++ b/metropolis/test/launch/cli/launch-cluster/main.go
@@ -19,14 +19,15 @@
 import (
 	"context"
 	"log"
+	"os"
+	"os/signal"
 
 	metroctl "source.monogon.dev/metropolis/cli/metroctl/core"
-	clicontext "source.monogon.dev/metropolis/cli/pkg/context"
 	"source.monogon.dev/metropolis/test/launch/cluster"
 )
 
 func main() {
-	ctx := clicontext.WithInterrupt(context.Background())
+	ctx, _ := signal.NotifyContext(context.Background(), os.Interrupt)
 	cl, err := cluster.LaunchCluster(ctx, cluster.ClusterOptions{
 		NumNodes:        3,
 		NodeLogsToFiles: true,