build_full: Remove sign_req() subshell and do full cleanup #705
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build-x-full uses a subshell to detect errors and cleanup the files if an error occurs. This does not work if Ctrl-C is pressed during the confirmation yes/no dialog.
Replace the subshell with an indicator, $on_error_build_full_cleanup, to force cleanup() to remove the CSR, key and certificate files when an error occurs or user presses Ctrl-C.
Closes: #680
Signed-off-by: Richard T Bonhomme tincantech@protonmail.com