libct/cg/sd/v2: "support" (ignore") memory.oom.group

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/cgroups/systemd/v2.go

@@ -128,6 +128,15 @@ func unifiedResToSystemdProps(conn *systemdDbus.Conn, res map[string]string) (pr
 				newProp("TasksAccounting", true),
 				newProp("TasksMax", num))
 
+		case "memory.oom.group":
+			// Setting this to 1 is roughly equivalent to OOMPolicy=kill
+			// (as per systemd.service(5) and
+			// https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html),
+			// but it's not clear what to do if it is unset or set
+			// to 0 in runc update, as there are two other possible
+			// values for OOMPolicy (continue/stop).
+			fallthrough
+
 		default:
 			// Ignore the unknown resource here -- will still be
 			// applied in Set which calls fs2.Set.