* avoids using the hardcoded default minute set when image is built - everyone gets a different minute every time they `docker run neilpang/acme.sh:latest daemon`
* allows specification of LE_CONFIG_HOME environment variable if configuration home is not at image build-time default - `docker run -e LE_CONFIG_HOME=/tmp neilpang/acme.sh:latest daemon`
* `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
