Merge pull request containerd#7051 from Iceber/fix-run-controller-manager-1.6

[release/1.6] ctr: fix label args used in NewContainer

Author: fuweid

Diff for: cmd/ctr/commands/run/run_unix.go

@@ -100,7 +100,7 @@ func NewContainer(ctx gocontext.Context, client *containerd.Client, context *cli
 	)
 
 	if config {
-		cOpts = append(cOpts, containerd.WithContainerLabels(commands.LabelArgs(context.StringSlice("labels"))))
+		cOpts = append(cOpts, containerd.WithContainerLabels(commands.LabelArgs(context.StringSlice("label"))))
 		opts = append(opts, oci.WithSpecFromFile(context.String("config")))
 	} else {
 		var (
@@ -121,7 +121,7 @@ func NewContainer(ctx gocontext.Context, client *containerd.Client, context *cli
 				return nil, err
 			}
 			opts = append(opts, oci.WithRootFSPath(rootfs))
-			cOpts = append(cOpts, containerd.WithContainerLabels(commands.LabelArgs(context.StringSlice("labels"))))
+			cOpts = append(cOpts, containerd.WithContainerLabels(commands.LabelArgs(context.StringSlice("label"))))
 		} else {
 			snapshotter := context.String("snapshotter")
 			var image containerd.Image