Update

vendor/tailscale.com/derp/derpconst/derpconst.go

@@ -0,0 +1,11 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Package derpconst contains constants used by the DERP client and server.
+package derpconst
+
+// MetaCertCommonNamePrefix is the prefix that the DERP server
+// puts on for the common name of its "metacert". The suffix of
+// the common name after "derpkey" is the hex key.NodePublic
+// of the DERP server.
+const MetaCertCommonNamePrefix = "derpkey"