feat(numlock): add module to turn Num Lock on

This module adds setleds and a shell script to turn Num Lock on.

Useful when you have to type a  password or a PIN to unlock a volume.

modules.d/90numlock/module-setup.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/bash
+# This file is part of dracut.
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Prerequisite check(s) for module.
+check() {
+
+    # If the binary(s) requirements are not fulfilled the module can't be installed.
+    require_binaries setleds || return 1
+
+    # Return 255 to only include the module, if another module requires it.
+    return 255
+
+}
+
+# Module dependency requirements.
+depends() {
+
+    # This module has external dependency on other module(s).
+    echo systemd-udevd
+    # Return 0 to include the dependent module(s) in the initramfs.
+    return 0
+
+}
+
+# Install the required file(s) and directories for the module in the initramfs.
+install() {
+
+    inst_multiple -o \
+        setleds
+
+    inst_hook initqueue/settled 90 "$moddir/numlock.sh"
+
+}

modules.d/90numlock/numlock.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/sh
+i=1
+while [ "${i}" -le 6 ]; do
+    setleds -D +num < /dev/tty"${i}"
+    i=$((i + 1))
+done