regenerate openssh-keys on first boot!

regenerate_ssh_host_keys_init.sh

#!/bin/bash
#
# This Script Regenerates the OpenSSH Host Keys, and deletes itself afterwards!
# Put this Script in the "/etc/rc5.d/" directory.
#
# Version: 1.1
# Author: ham5ter@ham5ter.de
# Date 02.08.2016
# SPDX-License-Identifier: MIT

echo "Deletes the old SSH Host Keys!"
/bin/rm -fv /etc/ssh/ssh_host_*
echo "Regenerating the SSH Host Keys!"
dpkg-reconfigure openssh-server

# Delete the Script itself!
/bin/rm "$0"

Are you willing to add an open source license to this?
May I suggest adding this line to the script:
# SPDX-License-Identifier: MIT

I updated the License, as you suggested (ham5ter here.),
Also I quote the $0 on Line 17, which in some cases might have been problematic otherwise ^^.
https://gist.github.com/Ham5ter/6cf693f67a1792b55f294969647a4e6a/revisions