Option to disable registration_info.json backups when running --account

[GrantGryczan]

Suggestion

I'd like an option to not generate backups when running dehydrated --account, because currently the backups just don't get automatically cleaned up otherwise. And I really have no use for these backups.

Here's the line that backs up the file:

dehydrated/dehydrated

Line 1657 in 4fd777e

cp -p "${ACCOUNT_KEY_JSON}" "${ACCOUNT_KEY_JSON_BACKUP}"

Why not just delete the backup files if I don't need them?

Well not only is that inconvenient, but in my case, I'm developing a Docker image integrating dehydrated with a declarative config. Ideally, a user of my image should be able to change their ACME account email without having to manually go into the Docker volume to delete these backup files. I could delete them automatically, but dehydrated also outputs a message saying the file was backed up, so deleting them would make that message misleading.