Remove obsolete file

vpn/base/files/ip-link-add.sh

@@ -1,8 +0,0 @@
-#!/usr/bin/env bash
-
-set -u
-
-if ! ip link show dev "${1}" > /dev/null 2>&1
-then
-    ip link add "${@}"
-fi

vpn/base/tasks/main.yml

@@ -52,10 +52,3 @@
     name: "bridge-utils"
     state: "absent"
     purge: true
-
-# TODO: remove once all interfaces have been moved.
-- name: "script for creating virtual interfaces"
-  ansible.builtin.copy:
-    src: "./ip-link-add.sh"
-    dest: "/usr/local/sbin/ip-link-add.sh"
-    mode: 0755