With blancco.debug=1 the init now also creates /etc/debug.environment in
the new root (Blancco's isDebugMode, so 2_sshd starts sshd) and installs
root's authorized_keys from http://<server>/blancco/debug_authorized_keys.
Root is locked and sshd is key-only, so normal boots stay closed and a
debug boot without that file on the server stays closed too.
Used to find where Albus keeps the finished report in process=auto, which
never auto-backs-up to the share. Live GetPxeScript.aspx has a matching
"Blancco Drive Eraser (debug / SSH)" item (UEFI, 7.0 kernel, verbose);
not in the playbook menu.
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