Add cpuset-mems flag to 'ctr run' command

This flag allows cpuset.mems to be specified when running a container. If
provided, the container will use only the defined memory nodes.

Signed-off-by: Peteris Rudzusiks <rye@stripe.com>

cmd/ctr/commands/run/run_unix.go

@@ -86,6 +86,10 @@ var platformRunFlags = []cli.Flag{
 		Name:  "cpuset-cpus",
 		Usage: "Set the CPUs the container will run in (e.g., 1-2,4)",
 	},
+	cli.StringFlag{
+		Name:  "cpuset-mems",
+		Usage: "Set the memory nodes the container will run in (e.g., 1-2,4)",
+	},
 }
 
 // NewContainer creates a new container
@@ -301,6 +305,10 @@ func NewContainer(ctx gocontext.Context, client *containerd.Client, context *cli
 			opts = append(opts, oci.WithCPUs(cpusetCpus))
 		}
 
+		if cpusetMems := context.String("cpuset-mems"); len(cpusetMems) > 0 {
+			opts = append(opts, oci.WithCPUsMems(cpusetMems))
+		}
+
 		if shares := context.Int("cpu-shares"); shares > 0 {
 			opts = append(opts, oci.WithCPUShares(uint64(shares)))
 		}