* `acme.sh`'s `ssh.sh` is probably one of the hooks that's most versatile
* By default, it's not installed on `alpine` docker images and therefore is lacking in the `acme.sh` docker image
* This change adds the `openssh` package and therefore the `ssh` and associated commands
Use more widely supported options for the "tr" command line utility b…y removing the use of the character class representation option. [:space:] => "\t\r\n\v\f"